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298 changes: 296 additions & 2 deletions lab-python-error-handling.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -72,11 +72,305 @@
"\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": "markdown",
"id": "449644e8",
"metadata": {},
"source": [
"1. 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."
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "e1925ab1",
"metadata": {},
"outputs": [],
"source": [
"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"
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "3f6ebb2b",
"metadata": {},
"outputs": [],
"source": [
"inventory = {}\n",
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"pen\"]"
]
},
{
"cell_type": "code",
"execution_count": 7,
"id": "6892227c",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error: invalid literal for int() with base 10: ' '\n",
"Error: invalid literal for int() with base 10: 'k'\n",
"Error: invalid literal for int() with base 10: '1.6'\n",
"{'t-shirt': 5, 'mug': 2, 'hat': 1, 'book': 10, 'pen': 6}\n"
]
}
],
"source": [
"inventory = initialize_inventory(products)\n",
"print(inventory)"
]
},
{
"cell_type": "markdown",
"id": "e2626f31",
"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."
]
},
{
"cell_type": "code",
"execution_count": 8,
"id": "e2338710",
"metadata": {},
"outputs": [],
"source": [
"def get_customer_orders():\n",
" num_orders = int(input(\"Enter the number of customer orders \"))\n",
" customer_orders = [input(\"Enter a product to order: \") for product in range(num_orders)]\n",
"\n",
" return customer_orders"
]
},
{
"cell_type": "code",
"execution_count": 9,
"id": "7cef5460",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"['mug', 'hat']\n"
]
}
],
"source": [
"orders = get_customer_orders()\n",
"print(orders)"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "7ddaa07e",
"metadata": {},
"outputs": [],
"source": [
"prices = [] #siempre poner las listas, dict, etc, FUERA de la función"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "f6247f42",
"metadata": {},
"outputs": [],
"source": [
"def total_price(orders):\n",
"\n",
" \n",
" for product in orders:\n",
" valid_price = False\n",
" \n",
" while not valid_price:\n",
" try:\n",
" price = float(input(f\"Enter the price of the {product}: \"))\n",
"\n",
" if price <= 0:\n",
" raise ValueError(\"The price cannot be negative or zero\")\n",
"\n",
" valid_price = True\n",
"\n",
" except ValueError as error:\n",
" print(f\"Error: {error}. Please, enter a valid price\")\n",
"\n",
" prices.append(price)\n",
" \n",
" return sum(prices)\n"
]
},
{
"cell_type": "code",
"execution_count": 22,
"id": "b3707237",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"11.0\n"
]
}
],
"source": [
"prices = total_price(orders)\n",
"print(prices)"
]
},
{
"cell_type": "code",
"execution_count": 16,
"id": "a7b0a362",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error: The price cannot be negative or zero. Please, enter a valid price\n",
"Error: The price cannot be negative or zero. Please, enter a valid price\n",
"Error: could not convert string to float: 'l'. Please, enter a valid price\n",
"Error: could not convert string to float: ' '. Please, enter a valid price\n",
"Error: could not convert string to float: ' '. Please, enter a valid price\n",
"Error: The price cannot be negative or zero. Please, enter a valid price\n",
"7.0\n"
]
}
],
"source": [
"prices = total_price(orders)\n",
"print(prices)"
]
},
{
"cell_type": "markdown",
"id": "954de579",
"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."
]
},
{
"cell_type": "code",
"execution_count": 43,
"id": "4ca0339c",
"metadata": {},
"outputs": [],
"source": [
" customer_orders = []"
]
},
{
"cell_type": "code",
"execution_count": 44,
"id": "0f58964c",
"metadata": {},
"outputs": [],
"source": [
"def get_customer_orders():\n",
" \n",
" valid_number = True\n",
" while valid_number:\n",
" try:\n",
" num_orders = int(input(\"Enter the number of customer orders \"))\n",
" if num_orders <= 0:\n",
" raise ValueError(\"The number of customer orders cannot be negative or 0\")\n",
" valid_number = False\n",
" except ValueError as error:\n",
" print(f\"Error: {error}. Please enter a valid number of customer orders\")\n",
"\n",
"\n",
"\n",
" for i in range(num_orders):\n",
" valid_product = True\n",
"\n",
" while valid_product:\n",
" try: \n",
" product = input(\"Enter a product to order:\")\n",
" if product not in inventory: \n",
" raise ValueError(\"This product is not in the inventory\")\n",
" if inventory[product]<= 0:\n",
" raise ValueError(\"This product doesn't have stock available\")\n",
" valid_product = False \n",
"\n",
" except ValueError as error:\n",
" print(f\"Error: {error}. Please enter a valid product.\")\n",
" \n",
" customer_orders.append(product)\n",
"\n",
" return customer_orders"
]
},
{
"cell_type": "code",
"execution_count": 45,
"id": "d97b76e2",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"['hat', 'book']\n"
]
}
],
"source": [
"orders = get_customer_orders()\n",
"print(orders)"
]
},
{
"cell_type": "code",
"execution_count": 46,
"id": "11c86164",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"['hat', 'book']\n"
]
}
],
"source": [
"print(customer_orders)"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "base",
"language": "python",
"name": "python3"
},
Expand All @@ -90,7 +384,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.13.9"
}
},
"nbformat": 4,
Expand Down