检查库存是否充足

本课属于 Coddy Python 学习旅程的“逻辑与流程”单元。第 70 课，共 78 课。

挑战

简单

创建一个名为 check_availability 的函数，它接受一个参数：item（字符串）。该函数应：

检查 inventory 字典中是否存在该商品。
- 如果不存在，则返回 "Item not found"。
如果该商品存在，则返回该商品的当前库存。

在代码底部添加（替换为）以下代码块：

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"

亲手试试

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.")


add_item("Apple", 0.5, 100)
add_item("Banana", 0.2, 50)
add_item("Apple", 0.6, 30)  # Should print an error
update_stock("Apple", -20)
update_stock("Banana", 30)
update_stock("Orange", 10)  # Should print an error
update_stock("Apple", -90)
print(inventory)