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  <div class="section content" id="module-assertpy.assertpy">
<span id="assertpy"></span><h1 class="title">assertpy<a class="headerlink" href="#module-assertpy.assertpy" title="Permalink to this headline">¶</a></h1>
<p>Assertion library for python unit testing with a fluent API</p>
<dl class="py class">
<dt class="title is-5" id="assertpy.assertpy.AssertionBuilder">
<em class="property">class </em><code class="sig-name descname">AssertionBuilder</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">val</span></em>, <em class="sig-param"><span class="n">description</span><span class="o">=</span><span class="default_value">''</span></em>, <em class="sig-param"><span class="n">kind</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">expected</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">logger</span><span class="o">=</span><span class="default_value">None</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.assertpy.AssertionBuilder" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <a class="reference internal" href="#assertpy.string.StringMixin" title="assertpy.string.StringMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.string.StringMixin</span></code></a>, <a class="reference internal" href="#assertpy.snapshot.SnapshotMixin" title="assertpy.snapshot.SnapshotMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.snapshot.SnapshotMixin</span></code></a>, <a class="reference internal" href="#assertpy.numeric.NumericMixin" title="assertpy.numeric.NumericMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.numeric.NumericMixin</span></code></a>, <a class="reference internal" href="#assertpy.helpers.HelpersMixin" title="assertpy.helpers.HelpersMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.helpers.HelpersMixin</span></code></a>, <a class="reference internal" href="#assertpy.file.FileMixin" title="assertpy.file.FileMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.file.FileMixin</span></code></a>, <a class="reference internal" href="#assertpy.extracting.ExtractingMixin" title="assertpy.extracting.ExtractingMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.extracting.ExtractingMixin</span></code></a>, <a class="reference internal" href="#assertpy.exception.ExceptionMixin" title="assertpy.exception.ExceptionMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.exception.ExceptionMixin</span></code></a>, <a class="reference internal" href="#assertpy.dynamic.DynamicMixin" title="assertpy.dynamic.DynamicMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.dynamic.DynamicMixin</span></code></a>, <a class="reference internal" href="#assertpy.dict.DictMixin" title="assertpy.dict.DictMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.dict.DictMixin</span></code></a>, <a class="reference internal" href="#assertpy.date.DateMixin" title="assertpy.date.DateMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.date.DateMixin</span></code></a>, <a class="reference internal" href="#assertpy.contains.ContainsMixin" title="assertpy.contains.ContainsMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.contains.ContainsMixin</span></code></a>, <a class="reference internal" href="#assertpy.collection.CollectionMixin" title="assertpy.collection.CollectionMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.collection.CollectionMixin</span></code></a>, <a class="reference internal" href="#assertpy.base.BaseMixin" title="assertpy.base.BaseMixin"><code class="xref py py-class docutils literal notranslate"><span class="pre">assertpy.base.BaseMixin</span></code></a>, <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
<p>The main assertion class.  Never call the constructor directly, always use the
<a class="reference internal" href="#assertpy.assertpy.assert_that" title="assertpy.assertpy.assert_that"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assert_that()</span></code></a> helper instead.  Or if you just want warning messages, use the
<a class="reference internal" href="#assertpy.assertpy.assert_warn" title="assertpy.assertpy.assert_warn"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assert_warn()</span></code></a> helper.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>val</strong> – the value to be tested (aka the actual value)</p></li>
<li><p><strong>description</strong> (<em>str</em><em>, </em><em>optional</em>) – the extra error message description.  Defaults to <code class="docutils literal notranslate"><span class="pre">''</span></code>
(aka empty string)</p></li>
<li><p><strong>kind</strong> (<em>str</em><em>, </em><em>optional</em>) – the kind of assertions, one of <code class="docutils literal notranslate"><span class="pre">None</span></code>, <code class="docutils literal notranslate"><span class="pre">soft</span></code>, or <code class="docutils literal notranslate"><span class="pre">warn</span></code>.
Defaults to <code class="docutils literal notranslate"><span class="pre">None</span></code></p></li>
<li><p><strong>expected</strong> (<em>Error</em><em>, </em><em>optional</em>) – the expected exception.  Defaults to <code class="docutils literal notranslate"><span class="pre">None</span></code></p></li>
<li><p><strong>logger</strong> (<em>Logger</em><em>, </em><em>optional</em>) – the logger for warning messages.  Defaults to <code class="docutils literal notranslate"><span class="pre">None</span></code></p></li>
</ul>
</dd>
</dl>
<dl class="py method">
<dt class="title is-5" id="assertpy.assertpy.AssertionBuilder.builder">
<code class="sig-name descname">builder</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">val</span></em>, <em class="sig-param"><span class="n">description</span><span class="o">=</span><span class="default_value">''</span></em>, <em class="sig-param"><span class="n">kind</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">expected</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">logger</span><span class="o">=</span><span class="default_value">None</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.assertpy.AssertionBuilder.builder" title="Permalink to this definition">¶</a></dt>
<dd><p>Helper to build a new <a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder"><code class="xref py py-class docutils literal notranslate"><span class="pre">AssertionBuilder</span></code></a> instance. Use this only if not chaining to <code class="docutils literal notranslate"><span class="pre">self</span></code>.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>val</strong> – the value to be tested (aka the actual value)</p></li>
<li><p><strong>description</strong> (<em>str</em><em>, </em><em>optional</em>) – the extra error message description.  Defaults to <code class="docutils literal notranslate"><span class="pre">''</span></code>
(aka empty string)</p></li>
<li><p><strong>kind</strong> (<em>str</em><em>, </em><em>optional</em>) – the kind of assertions, one of <code class="docutils literal notranslate"><span class="pre">None</span></code>, <code class="docutils literal notranslate"><span class="pre">soft</span></code>, or <code class="docutils literal notranslate"><span class="pre">warn</span></code>.
Defaults to <code class="docutils literal notranslate"><span class="pre">None</span></code></p></li>
<li><p><strong>expected</strong> (<em>Error</em><em>, </em><em>optional</em>) – the expected exception.  Defaults to <code class="docutils literal notranslate"><span class="pre">None</span></code></p></li>
<li><p><strong>logger</strong> (<em>Logger</em><em>, </em><em>optional</em>) – the logger for warning messages.  Defaults to <code class="docutils literal notranslate"><span class="pre">None</span></code></p></li>
</ul>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.assertpy.AssertionBuilder.error">
<code class="sig-name descname">error</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">msg</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.assertpy.AssertionBuilder.error" title="Permalink to this definition">¶</a></dt>
<dd><p>Helper to raise an <code class="docutils literal notranslate"><span class="pre">AssertionError</span></code> with the given message.</p>
<p>If an error description is set by <a class="reference internal" href="#assertpy.base.BaseMixin.described_as" title="assertpy.base.BaseMixin.described_as"><code class="xref py py-meth docutils literal notranslate"><span class="pre">described_as()</span></code></a>, then that
description is prepended to the error message.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>msg</strong> – the error message</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>
<p>Used to fail an assertion:</p>
<pre class="code"><code class="python"><span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">val</span> <span class="o">!=</span> <span class="n">other</span><span class="p">:</span>
    <span class="bp">self</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="s1">&#39;Expected &lt;</span><span class="si">%s</span><span class="s1">&gt; to be equal to &lt;</span><span class="si">%s</span><span class="s1">&gt;, but was not.&#39;</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">val</span><span class="p">,</span> <span class="n">other</span><span class="p">))</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – always raised unless <code class="docutils literal notranslate"><span class="pre">kind</span></code> is <code class="docutils literal notranslate"><span class="pre">warn</span></code> (as set when using an
    <a class="reference internal" href="#assertpy.assertpy.assert_warn" title="assertpy.assertpy.assert_warn"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assert_warn()</span></code></a> assertion) or <code class="docutils literal notranslate"><span class="pre">kind</span></code> is <code class="docutils literal notranslate"><span class="pre">soft</span></code> (as set when inside a
    <a class="reference internal" href="#assertpy.assertpy.soft_assertions" title="assertpy.assertpy.soft_assertions"><code class="xref py py-meth docutils literal notranslate"><span class="pre">soft_assertions()</span></code></a> context).</p>
</dd>
</dl>
</dd></dl>

</dd></dl>

<dl class="py function">
<dt class="title is-5" id="assertpy.assertpy.add_extension">
<code class="sig-name descname">add_extension</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">func</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.assertpy.add_extension" title="Permalink to this definition">¶</a></dt>
<dd><p>Add a new user-defined custom assertion to assertpy.</p>
<p>Once the assertion is registered with assertpy, use it like any other assertion.  Pass val to
<a class="reference internal" href="#assertpy.assertpy.assert_that" title="assertpy.assertpy.assert_that"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assert_that()</span></code></a>, and then call it.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>func</strong> – the assertion function (to be added)</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="kn">from</span> <span class="nn">assertpy</span> <span class="kn">import</span> <span class="n">add_extension</span>

<span class="k">def</span> <span class="nf">is_5</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">val</span> <span class="o">!=</span> <span class="mi">5</span><span class="p">:</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">error</span><span class="p">(</span><span class="sa">f</span><span class="s1">&#39;</span><span class="si">{self.val}</span><span class="s1"> is NOT 5!&#39;</span><span class="p">)</span>
    <span class="k">return</span> <span class="bp">self</span>

<span class="n">add_extension</span><span class="p">(</span><span class="n">is_5</span><span class="p">)</span>

<span class="k">def</span> <span class="nf">test_5</span><span class="p">():</span>
    <span class="n">assert_that</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span><span class="o">.</span><span class="n">is_5</span><span class="p">()</span>

<span class="k">def</span> <span class="nf">test_6</span><span class="p">():</span>
    <span class="n">assert_that</span><span class="p">(</span><span class="mi">6</span><span class="p">)</span><span class="o">.</span><span class="n">is_5</span><span class="p">()</span>  <span class="c1"># fails</span>
    <span class="c1"># 6 is NOT 5!</span>
</code></pre>
</dd></dl>

<dl class="py function">
<dt class="title is-5" id="assertpy.assertpy.assert_that">
<code class="sig-name descname">assert_that</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">val</span></em>, <em class="sig-param"><span class="n">description</span><span class="o">=</span><span class="default_value">''</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.assertpy.assert_that" title="Permalink to this definition">¶</a></dt>
<dd><p>Set the value to be tested, plus an optional description, and allow assertions to be called.</p>
<p>This is a factory method for the <a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder"><code class="xref py py-class docutils literal notranslate"><span class="pre">AssertionBuilder</span></code></a>, and the single most important
method in all of assertpy.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>val</strong> – the value to be tested (aka the actual value)</p></li>
<li><p><strong>description</strong> (<em>str</em><em>, </em><em>optional</em>) – the extra error message description. Defaults to <code class="docutils literal notranslate"><span class="pre">''</span></code>
(aka empty string)</p></li>
</ul>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>
<p>Just import it once at the top of your test file, and away you go…:</p>
<pre class="code"><code class="python"><span class="kn">from</span> <span class="nn">assertpy</span> <span class="kn">import</span> <span class="n">assert_that</span>

<span class="k">def</span> <span class="nf">test_something</span><span class="p">():</span>
    <span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">2</span><span class="p">)</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
    <span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foobar&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_length</span><span class="p">(</span><span class="mi">6</span><span class="p">)</span><span class="o">.</span><span class="n">starts_with</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">ends_with</span><span class="p">(</span><span class="s1">&#39;bar&#39;</span><span class="p">)</span>
    <span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">,</span> <span class="s1">&#39;c&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">contains</span><span class="p">(</span><span class="s1">&#39;a&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">does_not_contain</span><span class="p">(</span><span class="s1">&#39;x&#39;</span><span class="p">)</span>
</code></pre>
</dd></dl>

<dl class="py function">
<dt class="title is-5" id="assertpy.assertpy.assert_warn">
<code class="sig-name descname">assert_warn</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">val</span></em>, <em class="sig-param"><span class="n">description</span><span class="o">=</span><span class="default_value">''</span></em>, <em class="sig-param"><span class="n">logger</span><span class="o">=</span><span class="default_value">None</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.assertpy.assert_warn" title="Permalink to this definition">¶</a></dt>
<dd><p>Set the value to be tested, and optional description and logger, and allow assertions to be
called, but never fail, only log warnings.</p>
<p>This is a factory method for the <a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder"><code class="xref py py-class docutils literal notranslate"><span class="pre">AssertionBuilder</span></code></a>, but unlike <a class="reference internal" href="#assertpy.assertpy.assert_that" title="assertpy.assertpy.assert_that"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assert_that()</span></code></a> an
<cite>AssertionError</cite> is never raised, and execution is never halted.  Instead, any assertion failures
results in a warning message being logged. Uses the given logger, or defaults to a simple logger
that prints warnings to <code class="docutils literal notranslate"><span class="pre">stdout</span></code>.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>val</strong> – the value to be tested (aka the actual value)</p></li>
<li><p><strong>description</strong> (<em>str</em><em>, </em><em>optional</em>) – the extra error message description. Defaults to <code class="docutils literal notranslate"><span class="pre">''</span></code>
(aka empty string)</p></li>
<li><p><strong>logger</strong> (<em>Logger</em><em>, </em><em>optional</em>) – the logger for warning message on assertion failure. Defaults to <code class="docutils literal notranslate"><span class="pre">None</span></code>
(aka use the default simple logger that prints warnings to <code class="docutils literal notranslate"><span class="pre">stdout</span></code>)</p></li>
</ul>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="kn">from</span> <span class="nn">assertpy</span> <span class="kn">import</span> <span class="n">assert_warn</span>

<span class="n">assert_warn</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_length</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span>
<span class="n">assert_warn</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_empty</span><span class="p">()</span>
<span class="n">assert_warn</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_false</span><span class="p">()</span>
<span class="n">assert_warn</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_digit</span><span class="p">()</span>
<span class="n">assert_warn</span><span class="p">(</span><span class="s1">&#39;123&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_alpha</span><span class="p">()</span>
</code></pre>
<p>Even though all of the above assertions fail, <code class="docutils literal notranslate"><span class="pre">AssertionError</span></code> is never raised and
test execution is never halted.  Instead, the failed assertions merely log the following
warning messages to <code class="docutils literal notranslate"><span class="pre">stdout</span></code>:</p>
<pre class="code"><code class="bash"><span class="mi">2019</span><span class="o">-</span><span class="mi">10</span><span class="o">-</span><span class="mi">27</span> <span class="mi">20</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mi">35</span> <span class="n">WARNING</span> <span class="p">[</span><span class="n">test_foo</span><span class="o">.</span><span class="n">py</span><span class="p">:</span><span class="mi">23</span><span class="p">]:</span> <span class="n">Expected</span> <span class="o">&lt;</span><span class="n">foo</span><span class="o">&gt;</span> <span class="n">to</span> <span class="n">be</span> <span class="n">of</span> <span class="n">length</span> <span class="o">&lt;</span><span class="mi">4</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">but</span> <span class="n">was</span> <span class="o">&lt;</span><span class="mi">3</span><span class="o">&gt;.</span>
<span class="mi">2019</span><span class="o">-</span><span class="mi">10</span><span class="o">-</span><span class="mi">27</span> <span class="mi">20</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mi">35</span> <span class="n">WARNING</span> <span class="p">[</span><span class="n">test_foo</span><span class="o">.</span><span class="n">py</span><span class="p">:</span><span class="mi">24</span><span class="p">]:</span> <span class="n">Expected</span> <span class="o">&lt;</span><span class="n">foo</span><span class="o">&gt;</span> <span class="n">to</span> <span class="n">be</span> <span class="n">empty</span> <span class="n">string</span><span class="p">,</span> <span class="n">but</span> <span class="n">was</span> <span class="ow">not</span><span class="o">.</span>
<span class="mi">2019</span><span class="o">-</span><span class="mi">10</span><span class="o">-</span><span class="mi">27</span> <span class="mi">20</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mi">35</span> <span class="n">WARNING</span> <span class="p">[</span><span class="n">test_foo</span><span class="o">.</span><span class="n">py</span><span class="p">:</span><span class="mi">25</span><span class="p">]:</span> <span class="n">Expected</span> <span class="o">&lt;</span><span class="kc">False</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">but</span> <span class="n">was</span> <span class="ow">not</span><span class="o">.</span>
<span class="mi">2019</span><span class="o">-</span><span class="mi">10</span><span class="o">-</span><span class="mi">27</span> <span class="mi">20</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mi">35</span> <span class="n">WARNING</span> <span class="p">[</span><span class="n">test_foo</span><span class="o">.</span><span class="n">py</span><span class="p">:</span><span class="mi">26</span><span class="p">]:</span> <span class="n">Expected</span> <span class="o">&lt;</span><span class="n">foo</span><span class="o">&gt;</span> <span class="n">to</span> <span class="n">contain</span> <span class="n">only</span> <span class="n">digits</span><span class="p">,</span> <span class="n">but</span> <span class="n">did</span> <span class="ow">not</span><span class="o">.</span>
<span class="mi">2019</span><span class="o">-</span><span class="mi">10</span><span class="o">-</span><span class="mi">27</span> <span class="mi">20</span><span class="p">:</span><span class="mi">00</span><span class="p">:</span><span class="mi">35</span> <span class="n">WARNING</span> <span class="p">[</span><span class="n">test_foo</span><span class="o">.</span><span class="n">py</span><span class="p">:</span><span class="mi">27</span><span class="p">]:</span> <span class="n">Expected</span> <span class="o">&lt;</span><span class="mi">123</span><span class="o">&gt;</span> <span class="n">to</span> <span class="n">contain</span> <span class="n">only</span> <span class="n">alphabetic</span> <span class="n">chars</span><span class="p">,</span> <span class="n">but</span> <span class="n">did</span> <span class="ow">not</span><span class="o">.</span>
</code></pre>
<div class="message is-primary">
<p class="message-header">Tip</p>
<p class="message-body">Use <a class="reference internal" href="#assertpy.assertpy.assert_warn" title="assertpy.assertpy.assert_warn"><code class="xref py py-meth docutils literal notranslate"><span class="pre">assert_warn()</span></code></a> if and only if you have a <em>really</em> good reason to log assertion
failures instead of failing.</p>
</div>
</dd></dl>

<dl class="py function">
<dt class="title is-5" id="assertpy.assertpy.fail">
<code class="sig-name descname">fail</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">msg</span><span class="o">=</span><span class="default_value">''</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.assertpy.fail" title="Permalink to this definition">¶</a></dt>
<dd><p>Force immediate test failure with the given message.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>msg</strong> (<em>str</em><em>, </em><em>optional</em>) – the failure message.  Defaults to <code class="docutils literal notranslate"><span class="pre">''</span></code></p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>
<p>Fail a test:</p>
<pre class="code"><code class="python"><span class="kn">from</span> <span class="nn">assertpy</span> <span class="kn">import</span> <span class="n">assert_that</span><span class="p">,</span> <span class="n">fail</span>

<span class="k">def</span> <span class="nf">test_fail</span><span class="p">():</span>
    <span class="n">fail</span><span class="p">(</span><span class="s1">&#39;forced fail!&#39;</span><span class="p">)</span>
</code></pre>
<p>If you wanted to test for a known failure, here is a useful pattern:</p>
<pre class="code"><code class="python"><span class="kn">import</span> <span class="nn">operator</span>

<span class="k">def</span> <span class="nf">test_adder_bad_arg</span><span class="p">():</span>
    <span class="k">try</span><span class="p">:</span>
        <span class="n">operator</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;bad arg&#39;</span><span class="p">)</span>
        <span class="n">fail</span><span class="p">(</span><span class="s1">&#39;should have raised error&#39;</span><span class="p">)</span>
    <span class="k">except</span> <span class="ne">TypeError</span> <span class="k">as</span> <span class="n">e</span><span class="p">:</span>
        <span class="n">assert_that</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="n">e</span><span class="p">))</span><span class="o">.</span><span class="n">contains</span><span class="p">(</span><span class="s1">&#39;unsupported operand&#39;</span><span class="p">)</span>
</code></pre>
</dd></dl>

<dl class="py function">
<dt class="title is-5" id="assertpy.assertpy.remove_extension">
<code class="sig-name descname">remove_extension</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">func</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.assertpy.remove_extension" title="Permalink to this definition">¶</a></dt>
<dd><p>Remove a user-defined custom assertion.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>func</strong> – the assertion function (to be removed)</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="kn">from</span> <span class="nn">assertpy</span> <span class="kn">import</span> <span class="n">remove_extension</span>

<span class="n">remove_extension</span><span class="p">(</span><span class="n">is_5</span><span class="p">)</span>
</code></pre>
</dd></dl>

<dl class="py function">
<dt class="title is-5" id="assertpy.assertpy.soft_assertions">
<code class="sig-name descname">soft_assertions</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.assertpy.soft_assertions" title="Permalink to this definition">¶</a></dt>
<dd><p>Create a soft assertion context.</p>
<p>Normally, any assertion failure will halt test execution immediately by raising an error.
Soft assertions are way to collect assertion failures (and failure messages) together, to be
raised all at once at the end, without halting your test.</p>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>
<p>Create a soft assertion context, and some failing tests:</p>
<pre class="code"><code class="python"><span class="kn">from</span> <span class="nn">assertpy</span> <span class="kn">import</span> <span class="n">assert_that</span><span class="p">,</span> <span class="n">soft_assertions</span>

<span class="k">with</span> <span class="n">soft_assertions</span><span class="p">():</span>
    <span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_length</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span>
    <span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_empty</span><span class="p">()</span>
    <span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_false</span><span class="p">()</span>
    <span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_digit</span><span class="p">()</span>
    <span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;123&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_alpha</span><span class="p">()</span>
</code></pre>
<p>When the context ends, any assertion failures are collected together and a single
<code class="docutils literal notranslate"><span class="pre">AssertionError</span></code> is raised:</p>
<pre class="code"><code class="bash"><span class="ne">AssertionError</span><span class="p">:</span> <span class="n">soft</span> <span class="n">assertion</span> <span class="n">failures</span><span class="p">:</span>
<span class="mf">1.</span> <span class="n">Expected</span> <span class="o">&lt;</span><span class="n">foo</span><span class="o">&gt;</span> <span class="n">to</span> <span class="n">be</span> <span class="n">of</span> <span class="n">length</span> <span class="o">&lt;</span><span class="mi">4</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">but</span> <span class="n">was</span> <span class="o">&lt;</span><span class="mi">3</span><span class="o">&gt;.</span>
<span class="mf">2.</span> <span class="n">Expected</span> <span class="o">&lt;</span><span class="n">foo</span><span class="o">&gt;</span> <span class="n">to</span> <span class="n">be</span> <span class="n">empty</span> <span class="n">string</span><span class="p">,</span> <span class="n">but</span> <span class="n">was</span> <span class="ow">not</span><span class="o">.</span>
<span class="mf">3.</span> <span class="n">Expected</span> <span class="o">&lt;</span><span class="kc">False</span><span class="o">&gt;</span><span class="p">,</span> <span class="n">but</span> <span class="n">was</span> <span class="ow">not</span><span class="o">.</span>
<span class="mf">4.</span> <span class="n">Expected</span> <span class="o">&lt;</span><span class="n">foo</span><span class="o">&gt;</span> <span class="n">to</span> <span class="n">contain</span> <span class="n">only</span> <span class="n">digits</span><span class="p">,</span> <span class="n">but</span> <span class="n">did</span> <span class="ow">not</span><span class="o">.</span>
<span class="mf">5.</span> <span class="n">Expected</span> <span class="o">&lt;</span><span class="mi">123</span><span class="o">&gt;</span> <span class="n">to</span> <span class="n">contain</span> <span class="n">only</span> <span class="n">alphabetic</span> <span class="n">chars</span><span class="p">,</span> <span class="n">but</span> <span class="n">did</span> <span class="ow">not</span><span class="o">.</span>
</code></pre>
<div class="message is-info">
<p class="message-header">Note</p>
<p class="message-body">The soft assertion context only collects <em>assertion</em> failures, other errors such as
<code class="docutils literal notranslate"><span class="pre">TypeError</span></code> or <code class="docutils literal notranslate"><span class="pre">ValueError</span></code> are always raised immediately.  Triggering an explicit test
failure with <a class="reference internal" href="#assertpy.assertpy.fail" title="assertpy.assertpy.fail"><code class="xref py py-meth docutils literal notranslate"><span class="pre">fail()</span></code></a> will similarly halt execution immediately.  If you need more
forgiving behavior, use <a class="reference internal" href="#assertpy.assertpy.soft_fail" title="assertpy.assertpy.soft_fail"><code class="xref py py-meth docutils literal notranslate"><span class="pre">soft_fail()</span></code></a> to add a failure message without halting test
execution.</p>
</div>
</dd></dl>

<dl class="py function">
<dt class="title is-5" id="assertpy.assertpy.soft_fail">
<code class="sig-name descname">soft_fail</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">msg</span><span class="o">=</span><span class="default_value">''</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.assertpy.soft_fail" title="Permalink to this definition">¶</a></dt>
<dd><p>Within a <a class="reference internal" href="#assertpy.assertpy.soft_assertions" title="assertpy.assertpy.soft_assertions"><code class="xref py py-meth docutils literal notranslate"><span class="pre">soft_assertions()</span></code></a> context, append the failure message to the soft error list,
but do not halt test execution.</p>
<p>Otherwise, outside the context, acts identical to <a class="reference internal" href="#assertpy.assertpy.fail" title="assertpy.assertpy.fail"><code class="xref py py-meth docutils literal notranslate"><span class="pre">fail()</span></code></a> and forces immediate test
failure with the given message.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>msg</strong> (<em>str</em><em>, </em><em>optional</em>) – the failure message.  Defaults to <code class="docutils literal notranslate"><span class="pre">''</span></code></p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>
<p>Failing soft assertions:</p>
<pre class="code"><code class="python"><span class="kn">from</span> <span class="nn">assertpy</span> <span class="kn">import</span> <span class="n">assert_that</span><span class="p">,</span> <span class="n">soft_assertions</span><span class="p">,</span> <span class="n">soft_fail</span>

<span class="k">with</span> <span class="n">soft_assertions</span><span class="p">():</span>
    <span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
    <span class="n">soft_fail</span><span class="p">(</span><span class="s1">&#39;my message&#39;</span><span class="p">)</span>
    <span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">(</span><span class="s1">&#39;bar&#39;</span><span class="p">)</span>
</code></pre>
<p>Fails, and outputs the following soft error list:</p>
<pre class="code"><code class="bash">AssertionError: soft assertion failures:
1. Expected &lt;1&gt; to be equal to &lt;2&gt;, but was not.
2. Fail: my message!
3. Expected &lt;foo&gt; to be equal to &lt;bar&gt;, but was not.
</code></pre>
</dd></dl>

</div>
<div class="section content" id="module-assertpy.base">
<span id="base"></span><h1 class="title">base<a class="headerlink" href="#module-assertpy.base" title="Permalink to this headline">¶</a></h1>
<dl class="py class">
<dt class="title is-5" id="assertpy.base.BaseMixin">
<em class="property">class </em><code class="sig-name descname">BaseMixin</code><a class="headerlink" href="#assertpy.base.BaseMixin" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
<p>Base mixin.</p>
<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.described_as">
<code class="sig-name descname">described_as</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">description</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.described_as" title="Permalink to this definition">¶</a></dt>
<dd><p>Describes the assertion.  On failure, the description is included in the error message.</p>
<p>This is not an assertion itself.  But if the any of the following chained assertions fail,
the description will be included in addition to the regular error message.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>description</strong> – the error message description</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">described_as</span><span class="p">(</span><span class="s1">&#39;error msg desc&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>  <span class="c1"># fails</span>
<span class="c1"># [error msg desc] Expected &lt;1&gt; to be equal to &lt;2&gt;, but was not.</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.is_equal_to">
<code class="sig-name descname">is_equal_to</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">other</span></em>, <em class="sig-param"><span class="o">**</span><span class="n">kwargs</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.is_equal_to" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is equal to other.</p>
<p>Checks actual is equal to expected using the <code class="docutils literal notranslate"><span class="pre">==</span></code> operator. When val is <em>dict-like</em>,
optionally ignore or include keys when checking equality.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>other</strong> – the expected value</p></li>
<li><p><strong>**kwargs</strong> – see below</p></li>
</ul>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Keyword Arguments</dt>
<dd class="field-even"><ul class="simple">
<li><p><strong>ignore</strong> – the dict key (or list of keys) to ignore</p></li>
<li><p><strong>include</strong> – the dict key (of list of keys) to include</p></li>
</ul>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">2</span><span class="p">)</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mi">123</span><span class="p">)</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">(</span><span class="mi">123</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mf">123.4</span><span class="p">)</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">(</span><span class="mf">123.4</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span>
</code></pre>
<p>When the val is <em>dict-like</em>, keys can optionally be <em>ignored</em> when checking equality:</p>
<pre class="code"><code class="python"><span class="c1"># ignore a single key</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">},</span> <span class="n">ignore</span><span class="o">=</span><span class="s1">&#39;b&#39;</span><span class="p">)</span>

<span class="c1"># ignore multiple keys</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="s1">&#39;c&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">})</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">},</span> <span class="n">ignore</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;b&#39;</span><span class="p">,</span> <span class="s1">&#39;c&#39;</span><span class="p">])</span>

<span class="c1"># ignore nested keys</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="p">{</span><span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="s1">&#39;c&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">,</span> <span class="s1">&#39;d&#39;</span><span class="p">:</span> <span class="mi">4</span><span class="p">}})</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="p">{</span><span class="s1">&#39;d&#39;</span><span class="p">:</span> <span class="mi">4</span><span class="p">}},</span> <span class="n">ignore</span><span class="o">=</span><span class="p">[(</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">),</span> <span class="p">(</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;c&#39;</span><span class="p">)])</span>
</code></pre>
<p>When the val is <em>dict-like</em>, only certain keys can be <em>included</em> when checking equality:</p>
<pre class="code"><code class="python"><span class="c1"># include a single key</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">},</span> <span class="n">include</span><span class="o">=</span><span class="s1">&#39;a&#39;</span><span class="p">)</span>

<span class="c1"># include multiple keys</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="s1">&#39;c&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">})</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">},</span> <span class="n">include</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span>
</code></pre>
<p>Failure produces a nice error message:</p>
<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">is_equal_to</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>  <span class="c1"># fails</span>
<span class="c1"># Expected &lt;1&gt; to be equal to &lt;2&gt;, but was not.</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if actual is <strong>not</strong> equal to expected</p>
</dd>
</dl>
<div class="message is-primary">
<p class="message-header">Tip</p>
<p class="message-body">Using <a class="reference internal" href="#assertpy.base.BaseMixin.is_equal_to" title="assertpy.base.BaseMixin.is_equal_to"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_equal_to()</span></code></a> with a <code class="docutils literal notranslate"><span class="pre">float</span></code> val is just asking for trouble. Instead, you’ll
always want to use <em>fuzzy</em> numeric assertions like <a class="reference internal" href="#assertpy.numeric.NumericMixin.is_close_to" title="assertpy.numeric.NumericMixin.is_close_to"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_close_to()</span></code></a>
or <a class="reference internal" href="#assertpy.numeric.NumericMixin.is_between" title="assertpy.numeric.NumericMixin.is_between"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_between()</span></code></a>.</p>
</div>
<div class="message is-link">
<p class="message-header">See Also</p>
<p class="message-body"><a class="reference internal" href="#assertpy.string.StringMixin.is_equal_to_ignoring_case" title="assertpy.string.StringMixin.is_equal_to_ignoring_case"><code class="xref py py-meth docutils literal notranslate"><span class="pre">is_equal_to_ignoring_case()</span></code></a> - for case-insensitive string equality</p>
</div>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.is_false">
<code class="sig-name descname">is_false</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.is_false" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is false.</p>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="kc">False</span><span class="p">)</span><span class="o">.</span><span class="n">is_false</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span><span class="o">.</span><span class="n">is_false</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_false</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mf">0.0</span><span class="p">)</span><span class="o">.</span><span class="n">is_false</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">([])</span><span class="o">.</span><span class="n">is_false</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(())</span><span class="o">.</span><span class="n">is_false</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">({})</span><span class="o">.</span><span class="n">is_false</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="nb">set</span><span class="p">())</span><span class="o">.</span><span class="n">is_false</span><span class="p">()</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val <strong>is</strong> true</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.is_instance_of">
<code class="sig-name descname">is_instance_of</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">some_class</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.is_instance_of" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is an instance of the given class.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>some_class</strong> – the expected class</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">is_instance_of</span><span class="p">(</span><span class="nb">int</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_instance_of</span><span class="p">(</span><span class="nb">str</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mf">123.4</span><span class="p">)</span><span class="o">.</span><span class="n">is_instance_of</span><span class="p">(</span><span class="nb">float</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_instance_of</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_instance_of</span><span class="p">(</span><span class="nb">tuple</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_instance_of</span><span class="p">(</span><span class="nb">dict</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span><span class="o">.</span><span class="n">is_instance_of</span><span class="p">(</span><span class="nb">set</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="kc">True</span><span class="p">)</span><span class="o">.</span><span class="n">is_instance_of</span><span class="p">(</span><span class="nb">bool</span><span class="p">)</span>
</code></pre>
<p>With a user-defined class:</p>
<pre class="code"><code class="python"><span class="k">class</span> <span class="nc">Foo</span><span class="p">:</span> <span class="k">pass</span>
<span class="n">f</span> <span class="o">=</span> <span class="n">Foo</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="n">f</span><span class="p">)</span><span class="o">.</span><span class="n">is_instance_of</span><span class="p">(</span><span class="n">Foo</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="n">f</span><span class="p">)</span><span class="o">.</span><span class="n">is_instance_of</span><span class="p">(</span><span class="nb">object</span><span class="p">)</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val is <strong>not</strong> an instance of the given class</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.is_length">
<code class="sig-name descname">is_length</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">length</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.is_length" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is the given length.</p>
<p>Checks val is the given length using the <code class="docutils literal notranslate"><span class="pre">len()</span></code> built-in.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>length</strong> (<em>int</em>) – the expected length</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_length</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_length</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_length</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_length</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span><span class="o">.</span><span class="n">is_length</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val is <strong>not</strong> the given length</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.is_none">
<code class="sig-name descname">is_none</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.is_none" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is none.</p>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="kc">None</span><span class="p">)</span><span class="o">.</span><span class="n">is_none</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="nb">print</span><span class="p">(</span><span class="s1">&#39;hello world&#39;</span><span class="p">))</span><span class="o">.</span><span class="n">is_none</span><span class="p">()</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val is <strong>not</strong> none</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.is_not_equal_to">
<code class="sig-name descname">is_not_equal_to</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">other</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.is_not_equal_to" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is not equal to other.</p>
<p>Checks actual is not equal to expected using the <code class="docutils literal notranslate"><span class="pre">!=</span></code> operator.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>other</strong> – the expected value</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span> <span class="o">+</span> <span class="mi">2</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_equal_to</span><span class="p">(</span><span class="mi">4</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_equal_to</span><span class="p">(</span><span class="s1">&#39;bar&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mi">123</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_equal_to</span><span class="p">(</span><span class="mi">456</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mf">123.4</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_equal_to</span><span class="p">(</span><span class="mf">567.8</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_not_equal_to</span><span class="p">([</span><span class="s1">&#39;c&#39;</span><span class="p">,</span> <span class="s1">&#39;d&#39;</span><span class="p">])</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_not_equal_to</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">4</span><span class="p">))</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_not_equal_to</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">})</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span><span class="o">.</span><span class="n">is_not_equal_to</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;x&#39;</span><span class="p">})</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if actual <strong>is</strong> equal to expected</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.is_not_none">
<code class="sig-name descname">is_not_none</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.is_not_none" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is not none.</p>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_none</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_none</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="kc">False</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_none</span><span class="p">()</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val <strong>is</strong> none</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.is_not_same_as">
<code class="sig-name descname">is_not_same_as</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">other</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.is_not_same_as" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is not identical to other.</p>
<p>Checks actual is not identical to expected using the <code class="docutils literal notranslate"><span class="pre">is</span></code> operator.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>other</strong> – the expected value</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_same_as</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_same_as</span><span class="p">(</span><span class="s1">&#39;bar&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mf">123.4</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_same_as</span><span class="p">(</span><span class="mf">567.8</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_not_same_as</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">4</span><span class="p">))</span>

<span class="c1"># mutable collections, even if equal, are not identical...</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_not_same_as</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_not_same_as</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span><span class="o">.</span><span class="n">is_not_same_as</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if actual <strong>is</strong> identical to expected</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.is_same_as">
<code class="sig-name descname">is_same_as</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">other</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.is_same_as" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is identical to other.</p>
<p>Checks actual is identical to expected using the <code class="docutils literal notranslate"><span class="pre">is</span></code> operator.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>other</strong> – the expected value</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>
<p>Basic types are identical:</p>
<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">is_same_as</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_same_as</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mf">123.4</span><span class="p">)</span><span class="o">.</span><span class="n">is_same_as</span><span class="p">(</span><span class="mf">123.4</span><span class="p">)</span>
</code></pre>
<p>As are immutables like <code class="docutils literal notranslate"><span class="pre">tuple</span></code>:</p>
<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_same_as</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span>
</code></pre>
<p>But mutable collections like <code class="docutils literal notranslate"><span class="pre">list</span></code>, <code class="docutils literal notranslate"><span class="pre">dict</span></code>, and <code class="docutils literal notranslate"><span class="pre">set</span></code> are not:</p>
<pre class="code"><code class="python"><span class="c1"># these all fail...</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_same_as</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span>  <span class="c1"># fails</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_same_as</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span>  <span class="c1"># fails</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span><span class="o">.</span><span class="n">is_same_as</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span>  <span class="c1"># fails</span>
</code></pre>
<p>Unless they are the same object:</p>
<pre class="code"><code class="python"><span class="n">x</span> <span class="o">=</span> <span class="p">{</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">}</span>
<span class="n">y</span> <span class="o">=</span> <span class="n">x</span>
<span class="n">assert_that</span><span class="p">(</span><span class="n">x</span><span class="p">)</span><span class="o">.</span><span class="n">is_same_as</span><span class="p">(</span><span class="n">y</span><span class="p">)</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if actual is <strong>not</strong> identical to expected</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.is_true">
<code class="sig-name descname">is_true</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.is_true" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is true.</p>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="kc">True</span><span class="p">)</span><span class="o">.</span><span class="n">is_true</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">is_true</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_true</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mf">1.0</span><span class="p">)</span><span class="o">.</span><span class="n">is_true</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_true</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_true</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_true</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span><span class="o">.</span><span class="n">is_true</span><span class="p">()</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val <strong>is</strong> false</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.base.BaseMixin.is_type_of">
<code class="sig-name descname">is_type_of</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">some_type</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.base.BaseMixin.is_type_of" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is of the given type.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>some_type</strong> (<em>type</em>) – the expected type</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">is_type_of</span><span class="p">(</span><span class="nb">int</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_type_of</span><span class="p">(</span><span class="nb">str</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mf">123.4</span><span class="p">)</span><span class="o">.</span><span class="n">is_type_of</span><span class="p">(</span><span class="nb">float</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_type_of</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_type_of</span><span class="p">(</span><span class="nb">tuple</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_type_of</span><span class="p">(</span><span class="nb">dict</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span><span class="o">.</span><span class="n">is_type_of</span><span class="p">(</span><span class="nb">set</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="kc">True</span><span class="p">)</span><span class="o">.</span><span class="n">is_type_of</span><span class="p">(</span><span class="nb">bool</span><span class="p">)</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val is <strong>not</strong> of the given type</p>
</dd>
</dl>
</dd></dl>

</dd></dl>

</div>
<div class="section content" id="module-assertpy.collection">
<span id="collection"></span><h1 class="title">collection<a class="headerlink" href="#module-assertpy.collection" title="Permalink to this headline">¶</a></h1>
<dl class="py class">
<dt class="title is-5" id="assertpy.collection.CollectionMixin">
<em class="property">class </em><code class="sig-name descname">CollectionMixin</code><a class="headerlink" href="#assertpy.collection.CollectionMixin" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
<p>Collection assertions mixin.</p>
<dl class="py method">
<dt class="title is-5" id="assertpy.collection.CollectionMixin.is_iterable">
<code class="sig-name descname">is_iterable</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.collection.CollectionMixin.is_iterable" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is iterable collection.</p>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_iterable</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_iterable</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_iterable</span><span class="p">()</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val is <strong>not</strong> iterable</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.collection.CollectionMixin.is_not_iterable">
<code class="sig-name descname">is_not_iterable</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.collection.CollectionMixin.is_not_iterable" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is not iterable collection.</p>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_iterable</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="mf">123.4</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_iterable</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="kc">True</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_iterable</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">(</span><span class="kc">None</span><span class="p">)</span><span class="o">.</span><span class="n">is_not_iterable</span><span class="p">()</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val <strong>is</strong> iterable</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.collection.CollectionMixin.is_sorted">
<code class="sig-name descname">is_sorted</code><span class="sig-paren">(</span><em class="sig-param">key=&lt;function CollectionMixin.&lt;lambda&gt;&gt;</em>, <em class="sig-param">reverse=False</em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.collection.CollectionMixin.is_sorted" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is iterable and is sorted.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>key</strong> (<em>function</em>) – the one-arg function to extract the sort comparison key.  Defaults to
<code class="docutils literal notranslate"><span class="pre">lambda</span> <span class="pre">x:</span> <span class="pre">x</span></code> to just compare items directly.</p></li>
<li><p><strong>reverse</strong> (<em>bool</em>) – if <code class="docutils literal notranslate"><span class="pre">True</span></code>, then comparison key is reversed.  Defaults to <code class="docutils literal notranslate"><span class="pre">False</span></code>.</p></li>
</ul>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">,</span> <span class="s1">&#39;c&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_sorted</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_sorted</span><span class="p">()</span>

<span class="c1"># with a key function</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;aBc&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_sorted</span><span class="p">(</span><span class="n">key</span><span class="o">=</span><span class="nb">str</span><span class="o">.</span><span class="n">lower</span><span class="p">)</span>

<span class="c1"># reverse order</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;c&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">,</span> <span class="s1">&#39;a&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_sorted</span><span class="p">(</span><span class="n">reverse</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">3</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">))</span><span class="o">.</span><span class="n">is_sorted</span><span class="p">(</span><span class="n">reverse</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>

<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="o">-</span><span class="mi">5</span><span class="p">,</span> <span class="mi">6</span><span class="p">))</span><span class="o">.</span><span class="n">is_sorted</span><span class="p">()</span>  <span class="c1"># fails</span>
<span class="c1"># Expected &lt;(1, 2, 3, 4, -5, 6)&gt; to be sorted, but subset &lt;4, -5&gt; at index 3 is not.</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val is <strong>not</strong> sorted</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.collection.CollectionMixin.is_subset_of">
<code class="sig-name descname">is_subset_of</code><span class="sig-paren">(</span><em class="sig-param"><span class="o">*</span><span class="n">supersets</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.collection.CollectionMixin.is_subset_of" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is iterable and a subset of the given superset (or supersets).</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>*supersets</strong> – the expected superset (or supersets)</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_subset_of</span><span class="p">(</span><span class="s1">&#39;abcdefghijklmnopqrstuvwxyz&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">is_subset_of</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">,</span> <span class="s1">&#39;c&#39;</span><span class="p">])</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_subset_of</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">4</span><span class="p">])</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_subset_of</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="s1">&#39;c&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">})</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span><span class="o">.</span><span class="n">is_subset_of</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">,</span> <span class="s1">&#39;c&#39;</span><span class="p">})</span>

<span class="c1"># or multiple supersets (as comma-separated args)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;aBc&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_subset_of</span><span class="p">(</span><span class="s1">&#39;abc&#39;</span><span class="p">,</span> <span class="s1">&#39;ABC&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">is_subset_of</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">5</span><span class="p">],</span> <span class="p">[</span><span class="mi">2</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">6</span><span class="p">])</span>

<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">is_subset_of</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;c&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">})</span>  <span class="c1"># fails</span>
<span class="c1"># Expected &lt;{&#39;a&#39;: 1, &#39;b&#39;: 2}&gt; to be subset of &lt;{&#39;a&#39;: 1, &#39;c&#39;: 3}&gt;, but &lt;{&#39;b&#39;: 2}&gt; was missing.</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val is <strong>not</strong> subset of given superset (or supersets)</p>
</dd>
</dl>
</dd></dl>

</dd></dl>

</div>
<div class="section content" id="module-assertpy.contains">
<span id="contains"></span><h1 class="title">contains<a class="headerlink" href="#module-assertpy.contains" title="Permalink to this headline">¶</a></h1>
<dl class="py class">
<dt class="title is-5" id="assertpy.contains.ContainsMixin">
<em class="property">class </em><code class="sig-name descname">ContainsMixin</code><a class="headerlink" href="#assertpy.contains.ContainsMixin" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
<p>Containment assertions mixin.</p>
<dl class="py method">
<dt class="title is-5" id="assertpy.contains.ContainsMixin.contains">
<code class="sig-name descname">contains</code><span class="sig-paren">(</span><em class="sig-param"><span class="o">*</span><span class="n">items</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.contains.ContainsMixin.contains" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val contains the given item or items.</p>
<p>Checks if the collection contains the given item or items using <code class="docutils literal notranslate"><span class="pre">in</span></code> operator.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>*items</strong> – the item or items expected to be contained</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">contains</span><span class="p">(</span><span class="s1">&#39;f&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">contains</span><span class="p">(</span><span class="s1">&#39;f&#39;</span><span class="p">,</span> <span class="s1">&#39;oo&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">contains</span><span class="p">(</span><span class="s1">&#39;b&#39;</span><span class="p">,</span> <span class="s1">&#39;a&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">))</span><span class="o">.</span><span class="n">contains</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">})</span><span class="o">.</span><span class="n">contains</span><span class="p">(</span><span class="s1">&#39;b&#39;</span><span class="p">,</span> <span class="s1">&#39;a&#39;</span><span class="p">)</span>  <span class="c1"># checks keys</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span><span class="o">.</span><span class="n">contains</span><span class="p">(</span><span class="s1">&#39;b&#39;</span><span class="p">,</span> <span class="s1">&#39;a&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">([</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span class="p">])</span><span class="o">.</span><span class="n">is_type_of</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span><span class="o">.</span><span class="n">contains</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span><span class="o">.</span><span class="n">does_not_contain</span><span class="p">(</span><span class="mi">4</span><span class="p">,</span> <span class="mi">5</span><span class="p">)</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val does <strong>not</strong> contain the item or items</p>
</dd>
</dl>
<div class="message is-primary">
<p class="message-header">Tip</p>
<p class="message-body">Use the <a class="reference internal" href="#assertpy.dict.DictMixin.contains_key" title="assertpy.dict.DictMixin.contains_key"><code class="xref py py-meth docutils literal notranslate"><span class="pre">contains_key()</span></code></a> alias when working with
<em>dict-like</em> objects to be self-documenting.</p>
</div>
<div class="message is-link">
<p class="message-header">See Also</p>
<p class="message-body"><a class="reference internal" href="#assertpy.string.StringMixin.contains_ignoring_case" title="assertpy.string.StringMixin.contains_ignoring_case"><code class="xref py py-meth docutils literal notranslate"><span class="pre">contains_ignoring_case()</span></code></a> - for case-insensitive string contains</p>
</div>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.contains.ContainsMixin.contains_duplicates">
<code class="sig-name descname">contains_duplicates</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.contains.ContainsMixin.contains_duplicates" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val is iterable and <em>does</em> contain duplicates.</p>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">contains_duplicates</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">contains_duplicates</span><span class="p">()</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span><span class="o">.</span><span class="n">contains_duplicates</span><span class="p">()</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>
<dd class="field-odd"><p>returns this instance to chain to the next assertion</p>
</dd>
<dt class="field-even subtitle"style="margin:0.2em 0;">Return type</dt>
<dd class="field-even"><p><a class="reference internal" href="#assertpy.assertpy.AssertionBuilder" title="assertpy.assertpy.AssertionBuilder">AssertionBuilder</a></p>
</dd>
<dt class="field-odd subtitle"style="margin:0.2em 0;">Raises</dt>
<dd class="field-odd"><p><strong>AssertionError</strong> – if val does <strong>not</strong> contain any duplicates</p>
</dd>
</dl>
</dd></dl>

<dl class="py method">
<dt class="title is-5" id="assertpy.contains.ContainsMixin.contains_only">
<code class="sig-name descname">contains_only</code><span class="sig-paren">(</span><em class="sig-param"><span class="o">*</span><span class="n">items</span></em><span class="sig-paren">)</span><a class="headerlink" href="#assertpy.contains.ContainsMixin.contains_only" title="Permalink to this definition">¶</a></dt>
<dd><p>Asserts that val contains <em>only</em> the given item or items.</p>
<p>Checks if the collection contains only the given item or items using <code class="docutils literal notranslate"><span class="pre">in</span></code> operator.</p>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Parameters</dt>
<dd class="field-odd"><p><strong>*items</strong> – the <em>only</em> item or items expected to be contained</p>
</dd>
</dl>
<p class="rubric subtitle"style="margin:0.2em 0;">Examples</p>

<pre class="code"><code class="python"><span class="n">assert_that</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">contains_only</span><span class="p">(</span><span class="s1">&#39;f&#39;</span><span class="p">,</span> <span class="s1">&#39;o&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">([</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">])</span><span class="o">.</span><span class="n">contains_only</span><span class="p">(</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">((</span><span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">))</span><span class="o">.</span><span class="n">contains_only</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;a&#39;</span><span class="p">:</span> <span class="mi">2</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">:</span> <span class="mi">3</span><span class="p">})</span><span class="o">.</span><span class="n">contains_only</span><span class="p">(</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">)</span>
<span class="n">assert_that</span><span class="p">({</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">})</span><span class="o">.</span><span class="n">contains_only</span><span class="p">(</span><span class="s1">&#39;a&#39;</span><span class="p">,</span> <span class="s1">&#39;b&#39;</span><span class="p">)</span>
</code></pre>
<dl class="field-list simple">
<dt class="field-odd subtitle"style="margin:0.2em 0;">Returns</dt>