Week 3 Lab 2

lab-python-error-handling.ipynb

@@ -72,11 +72,137 @@
     "\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": "e5e40ddb",
+   "metadata": {
+    "vscode": {
+     "languageId": "plaintext"
+    }
+   },
+   "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": 18,
+   "id": "1423664e",
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "SyntaxError",
+     "evalue": "invalid syntax (1844852863.py, line 12)",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;36m  Cell \u001b[0;32mIn[18], line 12\u001b[0;36m\u001b[0m\n\u001b[0;31m    except ValueError:\u001b[0m\n\u001b[0m    ^\u001b[0m\n\u001b[0;31mSyntaxError\u001b[0m\u001b[0;31m:\u001b[0m invalid syntax\n"
+     ]
+    }
+   ],
+   "source": [
+    "def calculate_total_price(customer_orders):\n",
+    "    \n",
+    "    for product in customer_orders:\n",
+    "        while True:\n",
+    "            try:\n",
+    "                price = int(input(\"Enter price of the product: \"))\n",
+    "                if price >= 0:\n",
+    "                    customer_orders[product] = price\n",
+    "                    break\n",
+    "                else:\n",
+    "                    print(\"Price must be non-negative value:\")\n",
+    "                except ValueError:\n",
+    "                print(\"Enter a valid number:\")\n",
+    "\n",
+    "prices = { product: float(input(\"Enter the price of product: \")) for product in customer_orders}\n",
+    "                    total_price = sum(prices.values())\n",
+    "                    return total_price"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "dba58348",
+   "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": 20,
+   "id": "dcf38fec",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def get_customer_orders(inventory):\n",
+    "    customer_orders = set()\n",
+    "    valid_num_orders = False\n",
+    "    \n",
+    "    while not valid_num_orders:\n",
+    "        try:\n",
+    "            num_orders = int(input(\"Enter the number of customer orders: \"))\n",
+    "            if num_orders > 0:\n",
+    "                valid_num_orders = True\n",
+    "            else:\n",
+    "                print(\"Number of orders must be a positive integer.\")\n",
+    "        except ValueError:\n",
+    "            print(\"Invalid input. Number of orders must be a positive integer.\")\n",
+    "    \n",
+    "    for _ in range(num_orders):\n",
+    "        valid_product = False\n",
+    "        while not valid_product:\n",
+    "            try:\n",
+    "                product = input(\"Enter the name of a product that a customer wants to order: \")\n",
+    "                if product in inventory and inventory[product] > 0:\n",
+    "                    customer_orders.add(product)\n",
+    "                    valid_product = True\n",
+    "                else:\n",
+    "                    print(\"Invalid product name or out of stock. Please enter a valid product.\")\n",
+    "            except ValueError:\n",
+    "                print(\"Invalid input. Please enter a valid product.\")\n",
+    "    \n",
+    "    return customer_orders\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "2c284275",
+   "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": "a43fe9ed",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Invalid input. Number of orders must be a positive integer.\n",
+      "Invalid input. Number of orders must be a positive integer.\n"
+     ]
+    }
+   ],
+   "source": [
+    "inventory = {\"apple\": 5, \"banana\": 3, \"orange\": 0}\n",
+    "customer_orders = get_customer_orders(inventory)\n",
+    "print(\"Customer orders:\", customer_orders)"
+   ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "base",
    "language": "python",
    "name": "python3"
   },
@@ -90,7 +216,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.13.9"
   }
  },
  "nbformat": 4,