why we use types task

Author: ebrahimbeiati

sprint-5/why_we_use_types.py

@@ -0,0 +1,52 @@
+#=================================================================================
+# Exercise 1: Predict what double("22") will do. Then run the code and check.
+# Did it do what you expected? Why did it return the value it did?
+#=================================================================================
+def double(value):
+    return value * 2
+
+# Prediction:
+# double("22") will return "2222" because when you multiply a string by
+#  an integer in Python, it concatenates the string that many times.
+#  So "22" * 2 will result in "22" + "22", which is "2222".
+
+print("Exercise 1: double('22') =", double("22"))
+
+# Actual output: double('22') = 2222
+
+#=================================================================================
+# Identify the bug in double()
+#=================================================================================
+def double_bug(number):
+    # Bug: This function is called "double" but multiplies the input by 3 instead of 2.
+    # This is a logic error, not a type error
+    return number * 3
+
+print("Exercise 2:", double_bug(10))
+
+#=================================================================================
+# About half(), double(), second()
+#=================================================================================
+def half(value):
+    return value / 2 
+
+def double(value):
+    return value * 2 
+
+def second(value):
+    return value[1]
+# Prediction and explanation:
+
+# half(22) --> 11.0
+# half("hello") --> TypeError, because you cannot divide a string by a number.
+# half("22") --> TypeError, because you cannot divide a string by a number.
+
+# double_correct(22) --> 44
+# double_correct("hello") --> "hellohello", because multiplying a string by an integer concatenates it.
+# double_correct("22") --> "2222"
+
+# second(22) --> TypeError, because you cannot index an integer.
+# second(0 x 16) --> TypeError, because you cannot index an integer.
+# second("hello") --> "e", because it returns the second character of the string.
+# second("22") --> "2", because it returns the second character of the string.
+