Error Handling Lab Solved

.ipynb_checkpoints/lab-python-error-handling-checkpoint.ipynb

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+   "source": [
+    "# Lab | Error Handling"
+   ]
+  },
+  {
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+   "id": "bc99b386-7508-47a0-bcdb-d969deaf6c8b",
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+    "## Exercise: Error Handling for Managing Customer Orders\n",
+    "\n",
+    "The implementation of your code for managing customer orders assumes that the user will always enter a valid input. \n",
+    "\n",
+    "For example, we could modify the `initialize_inventory` function to include error handling.\n",
+    "   - If the user enters an invalid quantity (e.g., a negative value or a non-numeric value), display an error message and ask them to re-enter the quantity for that product.\n",
+    "   - Use a try-except block to handle the error and continue prompting the user until a valid quantity is entered.\n",
+    "\n",
+    "```python\n",
+    "# Step 1: Define the function for initializing the inventory with error handling\n",
+    "def initialize_inventory(products):\n",
+    "    inventory = {}\n",
+    "    for product in products:\n",
+    "        valid_quantity = False\n",
+    "        while not valid_quantity:\n",
+    "            try:\n",
+    "                quantity = int(input(f\"Enter the quantity of {product}s available: \"))\n",
+    "                if quantity < 0:\n",
+    "                    raise ValueError(\"Invalid quantity! Please enter a non-negative value.\")\n",
+    "                valid_quantity = True\n",
+    "            except ValueError as error:\n",
+    "                print(f\"Error: {error}\")\n",
+    "        inventory[product] = quantity\n",
+    "    return inventory\n",
+    "\n",
+    "# Or, in another way:\n",
+    "\n",
+    "def initialize_inventory(products):\n",
+    "    inventory = {}\n",
+    "    for product in products:\n",
+    "        valid_input = False\n",
+    "        while not valid_input:\n",
+    "            try:\n",
+    "                quantity = int(input(f\"Enter the quantity of {product}s available: \"))\n",
+    "                if quantity >= 0:\n",
+    "                    inventory[product] = quantity\n",
+    "                    valid_input = True\n",
+    "                else:\n",
+    "                    print(\"Quantity cannot be negative. Please enter a valid quantity.\")\n",
+    "            except ValueError:\n",
+    "                print(\"Invalid input. Please enter a valid quantity.\")\n",
+    "    return inventory\n",
+    "```\n",
+    "\n",
+    "Let's enhance your code by implementing error handling to handle invalid inputs.\n",
+    "\n",
+    "Follow the steps below to complete the exercise:\n",
+    "\n",
+    "2. Modify the `calculate_total_price` function to include error handling.\n",
+    "   - If the user enters an invalid price (e.g., a negative value or a non-numeric value), display an error message and ask them to re-enter the price for that product.\n",
+    "   - Use a try-except block to handle the error and continue prompting the user until a valid price is entered.\n",
+    "\n",
+    "3. Modify the `get_customer_orders` function to include error handling.\n",
+    "   - If the user enters an invalid number of orders (e.g., a negative value or a non-numeric value), display an error message and ask them to re-enter the number of orders.\n",
+    "   - If the user enters an invalid product name (e.g., a product name that is not in the inventory), or that doesn't have stock available, display an error message and ask them to re-enter the product name. *Hint: you will need to pass inventory as a parameter*\n",
+    "   - Use a try-except block to handle the error and continue prompting the user until a valid product name is entered.\n",
+    "\n",
+    "4. Test your code by running the program and deliberately entering invalid quantities and product names. Make sure the error handling mechanism works as expected.\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 27,
+   "id": "df2c29ad-43e5-42b2-b0d3-bd3282db464d",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "Enter the prices of hat e\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Please put absolute numbers! \n",
+      "None\n"
+     ]
+    }
+   ],
+   "source": [
+    "#2. Modify the `calculate_total_price` function to include error handling.\n",
+    "#If the user enters an invalid price (e.g., a negative value or a non-numeric value), \n",
+    "#display an error message and ask them to re-enter the price for that product.\n",
+    "#Use a try-except block to handle the error and continue prompting the user until a valid price is entered.\n",
+    "\n",
+    "def calculate_total_price(customer_orders):\n",
+    "    total_price = 0\n",
+    "\n",
+    "    for product, quantity in customer_orders.items():\n",
+    "        try : \n",
+    "            prices_input = input(f\"Enter the prices of {product}\")\n",
+    "            prices_list = prices_input.split(\",\")\n",
+    "            prices = [int(price.strip()) for price in prices_list if price] #list comprehension\n",
+    "            \n",
+    "        except ValueError :\n",
+    "            print (\"Please put absolute numbers! \")\n",
+    "            return None\n",
+    "         \n",
+    "            product_total_price = sum(prices) * quantity\n",
+    "            total_price += product_total_price\n",
+    "            \n",
+    "    return total_price\n",
+    "    \n",
+    "customer_orders = {\"hat\":1, \"mug\":2, \"book\":5, \"t-shirt\":3, \"keychain\":2}\n",
+    "print (calculate_total_price (customer_orders))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 42,
+   "id": "cf3944d3-85e8-4bfe-bbe8-c84d8c68226a",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "How many product are you ordering? -1\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "You cannot enter negative number!\n"
+     ]
+    },
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "How many product are you ordering? e\n"
+     ]
+    },
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "please re-enter a valid absolute number!\n"
+     ]
+    },
+    {
+     "name": "stdin",
+     "output_type": "stream",
+     "text": [
+      "How many product are you ordering? 1\n",
+      "Enter the name of product:  hat\n",
+      "Enter the quantity:  1\n"
+     ]
+    },
+    {
+     "data": {
+      "text/plain": [
+       "{'hat': 1}"
+      ]
+     },
+     "execution_count": 42,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "#3. Modify the `get_customer_orders` function to include error handling.\n",
+    "#If the user enters an invalid number of orders (e.g., a negative value or a non-numeric value), \n",
+    "#display an error message and ask them to re-enter the number of orders\n",
+    "#Hint: you will need to pass inventory as a parameter*\n",
+    "#Use a try-except block to handle the error and continue prompting the user until a valid product name is entered\n",
+    "def get_customer_orders(inventory) : \n",
+    "    while True :\n",
+    "        try :\n",
+    "            num_of_products = int (input (\"How many product are you ordering?\"))\n",
+    "            if num_of_products < 0 :\n",
+    "                print (\"You cannot enter negative number!\")\n",
+    "            else :\n",
+    "                break \n",
+    "        except ValueError : \n",
+    "            print (\"please re-enter a valid absolute number!\")\n",
+    "        \n",
+    "    customer_orders = {input(\"Enter the name of product: \"): int(input(\"Enter the quantity: \")) for _ in range(num_of_products)}\n",
+    "    return customer_orders\n",
+    "\n",
+    "inventory = {\"hat\":1, \"mug\":2, \"book\":5, \"t-shirt\":3, \"keychain\":2}\n",
+    "get_customer_orders (inventory)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 31,
+   "id": "7e59ff37-bebe-4562-b72d-03849bcc3e4c",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#4 Test your code by running the program and deliberately entering invalid quantities and product names. \n",
+    "#Make sure the error handling mechanism works as expected."
+   ]
+  }
+ ],
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