Generate Report

Part of the Logic & Flow section of Coddy's Python journey — lesson 71 of 78.

Challenge

Hard

The inventory system already has these components implemented:

A global inventory dictionary where:
- Keys are item names (strings)
- Values are dictionaries containing:
  - "price": The price of the item (float)
  - "stock": Current quantity in stock (integer)
An add_item(item, price, stock) function that adds new items to inventory
An update_stock(item, quantity) function that updates the stock level
A check_availability(item) function that returns the current stock level

Your task is to implement the sales_report(sales) function that:

Takes a sales dictionary where:
- Keys are item names
- Values are quantities sold
For each item in the sales dictionary:
- Checks if the item exists in inventory
- Checks if there's sufficient stock
- Updates the inventory by reducing stock levels
- Calculates revenue based on price and quantity sold
Returns a formatted string with the total revenue

Handle these specific errors:

If an item doesn't exist in inventory, print: "Error: Item '{item}' not found."
If there's insufficient stock, print: "Error: Insufficient stock for '{item}'."

The output should be a string formatted as: “Total revenue: ${total:.2f}”

Add (replace) the following block of code at the bottom of your code:

add_item("Apple", 0.5, 50)
add_item("Banana", 0.2, 60)
sales = {"Apple": 30, "Banana": 20, "Orange": 10}  # Orange should print an error
print(sales_report(sales))  # Should output: Total revenue: $19.00
print(inventory)

Try it yourself

inventory = {}

def add_item(item, price, stock):
    if item in inventory:
        print(f"Error: Item '{item}' already exists.")
        return
    try:
        inventory[item] = {"price": float(price), "stock": int(stock)}
        print(f"Item '{item}' added successfully.")
    except ValueError:
        print("Error: Price and stock must be numeric.")

def update_stock(item, quantity):
    if item not in inventory:
        print(f"Error: Item '{item}' not found.")
        return
    try:
        new_stock = inventory[item]["stock"] + int(quantity)
        if new_stock < 0:
            print(f"Error: Insufficient stock for '{item}'.")
        else:
            inventory[item]["stock"] = new_stock
            print(f"Stock for '{item}' updated successfully.")
    except ValueError:
        print("Error: Quantity must be an integer.")

def check_availability(item):
    if item not in inventory:
        return "Item not found"
    return inventory[item]["stock"]


add_item("Apple", 0.5, 100)
add_item("Banana", 0.2, 50)
update_stock("Apple", -20)
update_stock("Banana", 30)
print(check_availability("Apple"))  # Should return 80
print(check_availability("Banana"))  # Should return 80
print(check_availability("Orange"))  # Should return "Item not found"