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Add error handling eylins lab #579

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179 changes: 172 additions & 7 deletions lab-python-error-handling.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -59,24 +59,189 @@
"\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",
"Follow the steps below to complete the exercise:"
]
},
{
"cell_type": "markdown",
"id": "bb370b51",
"metadata": {},
"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), 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",
" - Use a try-except block to handle the error and continue prompting the user until a valid price is entered."
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "e3d4a63b",
"metadata": {},
"outputs": [],
"source": [
"customer_orders = ['hat', 'keychain']\n",
"\n",
"def calculate_total_price():\n",
" valid_input = False \n",
" while not valid_input:\n",
" try:\n",
" prices = sum({order:int(input(f\"Enter a price for each {order} available\")) for order in customer_orders}.values())\n",
" if prices !=0:\n",
" sum_price = 0\n",
" valid_input = True\n",
" else: \n",
" print(\"Quantity not valid\")\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a valid quantity\")\n",
" \n",
" return prices "
]
},
{
"cell_type": "code",
"execution_count": 35,
"id": "d4287241",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Invalid input\n",
"Invalid input\n",
"Invalid input\n",
"Invalid input\n",
"Invalid input\n",
"Invalid input\n",
"Invalid input\n",
"Invalid input\n"
]
},
{
"data": {
"text/plain": [
"15"
]
},
"execution_count": 35,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"calculate_total_price()"
]
},
{
"cell_type": "markdown",
"id": "abd50211",
"metadata": {},
"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), 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",
" - Use a try-except block to handle the error and continue prompting the user until a valid product name is entered."
]
},
{
"cell_type": "code",
"execution_count": 3,
"id": "22cbee68",
"metadata": {},
"outputs": [],
"source": [
"inventory = {'mug': 1, 'hat': 2, 'keychain': 3, 'book': 4, 't-shirt': 5}"
]
},
{
"cell_type": "code",
"execution_count": 60,
"id": "7ef88815",
"metadata": {},
"outputs": [],
"source": [
"inventory = {'mug': 1, 'hat': 2, 'keychain': 3, 'book': 4, 't-shirt': 5}\n",
"customer_orders = set()\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"
"def get_customers_orders(): \n",
" valid_input = False \n",
" while not valid_input:\n",
" try:\n",
" order_products = int(input(f\"Enter a number of products that you wish to order\")) \n",
" if order_products !=0:\n",
" valid_input = True\n",
" else: \n",
" print(\"Quantity not valid\")\n",
" except ValueError:\n",
" print(\"Invalid input. Please enter a valid quantity\")\n",
" valid_input = False \n",
" while not valid_input:\n",
" for item in range(order_products):\n",
" try:\n",
" order = input(\"Enter a product\")\n",
" if order in inventory: \n",
" valid_input = True\n",
" customer_orders.add(order)\n",
" else:\n",
" print(\"Product isn't available in inventory\")\n",
" except TypeError:\n",
" print(\"Add a valid product. Keep trying\")\n",
"\n",
" return customer_orders\n",
" "
]
},
{
"cell_type": "code",
"execution_count": 61,
"id": "714898d1",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Product isn't available in inventory\n",
"Product isn't available in inventory\n"
]
},
{
"data": {
"text/plain": [
"{'hat', 'mug'}"
]
},
"execution_count": 61,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"customer_orders = get_customers_orders()\n",
"customer_orders\n",
"\n"
]
},
{
"cell_type": "markdown",
"id": "b8a20f36",
"metadata": {},
"source": [
"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."
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "027c9e6e",
"metadata": {},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "base",
"language": "python",
"name": "python3"
},
Expand All @@ -90,7 +255,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.13.5"
}
},
"nbformat": 4,
Expand Down