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Update lab-python-error-handling.ipynb #692

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Update lab-python-error-handling.ipynb
Juancarlosdelmarlostanau Sep 18, 2026
65651bd
Update lab-python-error-handling.ipynb
Juancarlosdelmarlostanau Sep 18, 2026
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179 changes: 167 additions & 12 deletions lab-python-error-handling.ipynb
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Expand Up @@ -13,13 +13,13 @@
"id": "bc99b386-7508-47a0-bcdb-d969deaf6c8b",
"metadata": {},
"source": [
"## Exercise: Error Handling for Managing Customer Orders\n",
"## Exercise: Handling errors to manage customer orders\n",
"\n",
"The implementation of your code for managing customer orders assumes that the user will always enter a valid input. \n",
"Implementing your code to manage customer orders assumes that the user will always enter 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",
" - If the user enters an invalid quantity (for example, a negative value or a non-numeric value), display an error message and ask the user 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 amount is entered.\n",
"\n",
"```python\n",
"# Step 1: Define the function for initializing the inventory with error handling\n",
Expand Down Expand Up @@ -57,26 +57,181 @@
" return inventory\n",
"```\n",
"\n",
"Let's enhance your code by implementing error handling to handle invalid inputs.\n",
"Let's improve your code by implementing error handling to handle invalid input.\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",
" - If the user enters an invalid price (for example, a negative value or a non-numeric value), display an error message and ask the user to re-enter the price of 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",
" - If the user enters an invalid order number (for example, a negative value or a non-numeric value), display an error message and ask the user to re-enter the order number.\n",
" - If the user enters an invalid product name (for example, a product name that is not in inventory) or has no stock available, it displays an error message and requests that the user enter the product name again. *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 they enter a valid product name.\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"
"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": 5,
"id": "76f35e97",
"metadata": {},
"outputs": [],
"source": [
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\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"
]
},
{
"cell_type": "markdown",
"id": "e4c4b90c",
"metadata": {},
"source": [
"2. Modifique la función `calcular_precio_total` para incluir el manejo de errores.\n",
" - Si el usuario ingresa un precio no válido (por ejemplo, un valor negativo o un valor no numérico), muestre un mensaje de error y pídale que vuelva a ingresar el precio de ese producto.\n",
" - Utilice un bloque try-except para manejar el error y continúe preguntando al usuario hasta que se ingrese un precio válido."
]
},
{
"cell_type": "code",
"execution_count": 6,
"id": "8f75b65e",
"metadata": {},
"outputs": [],
"source": [
"def calculate_total_price(productos):\n",
" precio_unitario = []\n",
" for producto in productos:\n",
" valid_price = False\n",
" while not valid_price:\n",
" try:\n",
" precio = float(input(f\"precio de {producto} es:\"))\n",
" if precio < 0:\n",
" raise ValueError(\"Invalid quantity! Please enter a non-negative value.\")\n",
" valid_price = True\n",
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
"\n",
" precio_unitario.append(precio)\n",
" return sum(precio_unitario)\n"
]
},
{
"cell_type": "markdown",
"id": "18fb8079",
"metadata": {},
"source": [
"3. Modifique la función `get_customer_orders` para incluir el manejo de errores.\n",
" - Si el usuario ingresa un número de pedido no válido (por ejemplo, un valor negativo o un valor no numérico), muestre un mensaje de error y solicite al usuario que vuelva a ingresar el número de pedido.\n",
" - Si el usuario ingresa un nombre de producto no válido (por ejemplo, un nombre de producto que no está en el inventario) o no tiene stock disponible, muestra un mensaje de error y solicita que el usuario ingrese el nombre del producto nuevamente. *Pista: necesitarás pasar el inventario como parámetro*\n",
" - Utilice un bloque try-except para manejar el error y continúe preguntando al usuario hasta que ingrese un nombre de producto válido."
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "1e22e3b1",
"metadata": {},
"outputs": [],
"source": [
"def get_customer_orders(inventory):\n",
" valid_quantity = False\n",
" while not valid_quantity:\n",
" try:\n",
" num_orders = int(input(\"Cantidad de pedidos\"))\n",
" if num_orders < 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",
" pedidos = []\n",
" for p in range(num_orders):\n",
" valid_products = False\n",
" while not valid_products:\n",
" try:\n",
" producto = input(f\"Ingrese una opcion entre: {list(inventory)}\").lower()\n",
" if producto not in inventory:\n",
" raise ValueError(f\"El producto no valido. Porfavor ingrese una opcion valida\")\n",
" elif inventory[producto] <= 0:\n",
" raise ValueError(f\"El producto {producto} no esta en stock\")\n",
" pedidos.append(producto)\n",
" valid_products = True\n",
" except ValueError as error:\n",
" print(f\"Error: {error}\")\n",
"\n",
" return pedidos"
]
},
{
"cell_type": "markdown",
"id": "00003acd",
"metadata": {},
"source": [
"4. Pruebe su código ejecutando el programa e ingresando deliberadamente cantidades y nombres de productos no válidos. Asegúrese de que el mecanismo de manejo de errores funcione como se esperaba."
]
},
{
"cell_type": "code",
"execution_count": 8,
"id": "4b120742",
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"Error: Invalid quantity! Please enter a non-negative value.\n",
"Error: invalid literal for int() with base 10: 'asd'\n",
"{'t-shirt': 1, 'mug': 0, 'hat': 2, 'book': 1, 'keychain': 0}\n",
"Error: Invalid quantity! Please enter a non-negative value.\n",
"Error: invalid literal for int() with base 10: 'asd'\n",
"Error: El producto no valido. Porfavor ingrese una opcion valida\n",
"Error: El producto no valido. Porfavor ingrese una opcion valida\n",
"Error: El producto mug no esta en stock\n",
"Error: El producto keychain no esta en stock\n",
"['hat', 'book']\n",
"20.0\n"
]
}
],
"source": [
"products = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
"inventory = initialize_inventory(products)\n",
"print(inventory)\n",
"\n",
"customer_orders = get_customer_orders(inventory)\n",
"print(customer_orders)\n",
"\n",
"print(calculate_total_price(customer_orders))"
]
},
{
"cell_type": "code",
"execution_count": null,
"id": "73030f3a",
"metadata": {},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"display_name": "base",
"language": "python",
"name": "python3"
},
Expand All @@ -90,7 +245,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.13"
"version": "3.14.6"
}
},
"nbformat": 4,
Expand Down