编写一个出入库程序

以下是一个简单的出入库程序的示例：

inventory = {}

def add_item(item_name, quantity):
    """
    Add an item to the inventory
    """
    if item_name in inventory:
        inventory[item_name] += quantity
    else:
        inventory[item_name] = quantity

def remove_item(item_name, quantity):
    """
    Remove an item from the inventory
    """
    if item_name in inventory:
        if inventory[item_name] >= quantity:
            inventory[item_name] -= quantity
            return True
        else:
            return False
    else:
        return False

def print_inventory():
    """
    Print the current contents of the inventory
    """
    for item_name, quantity in inventory.items():
        print(f"{item_name}: {quantity}")

# Example usage
add_item("apple", 10)
add_item("banana", 5)
add_item("apple", 5)
print_inventory() # Output: apple: 15, banana: 5

remove_item("apple", 12) # Returns False, as there are only 10 apples in inventory
remove_item("banana", 3) # Returns True, as there are 2 bananas left in inventory
print_inventory() # Output: apple: 10, banana: 2

这是一个简单的出入库程序，使用一个字典来存储库存信息。`add_item` 和 `remove_item` 函数分别用于添加和移除库存中的物品，而 `print_inventory` 函数则用于打印当前库存信息。