用pathon写一个商品管理系统

好的，一个商品管理系统需要涉及以下功能：

1. 商品的添加、修改、删除
2. 商品信息的查询和展示
3. 商品库存的管理
4. 商品销售记录的管理

以下是一个简单的示例代码：

class Product:
    def __init__(self, name, price, quantity):
        self.name = name
        self.price = price
        self.quantity = quantity

class Inventory:
    def __init__(self):
        self.product_list = []

    def add_product(self, product):
        self.product_list.append(product)

    def remove_product(self, product):
        self.product_list.remove(product)

    def get_product(self, product_name):
        for product in self.product_list:
            if product.name == product_name:
                return product
        return None

    def display_products(self):
        for product in self.product_list:
            print(f"{product.name} - Price: {product.price} - Quantity: {product.quantity}")

class SalesRecord:
    def __init__(self, product, quantity):
        self.product = product
        self.quantity = quantity

class SalesHistory:
    def __init__(self):
        self.sales_list = []

    def add_sale(self, sale):
        self.sales_list.append(sale)

    def display_sales(self):
        for sale in self.sales_list:
            print(f"{sale.product.name} - Quantity: {sale.quantity}")

inventory = Inventory()
sales_history = SalesHistory()

while True:
    print("1. Add product")
    print("2. Remove product")
    print("3. Get product")
    print("4. Display products")
    print("5. Sell product")
    print("6. Display sales history")
    print("7. Exit")

    choice = int(input("Enter your choice: "))

    if choice == 1:
        name = input("Enter product name: ")
        price = float(input("Enter product price: "))
        quantity = int(input("Enter product quantity: "))
        product = Product(name, price, quantity)
        inventory.add_product(product)

    elif choice == 2:
        name = input("Enter product name: ")
        product = inventory.get_product(name)
        if product:
            inventory.remove_product(product)
            print(f"{name} has been removed from inventory.")
        else:
            print(f"{name} is not in inventory.")

    elif choice == 3:
        name = input("Enter product name: ")
        product = inventory.get_product(name)
        if product:
            print(f"{product.name} - Price: {product.price} - Quantity: {product.quantity}")
        else:
            print(f"{name} is not in inventory.")

    elif choice == 4:
        inventory.display_products()

    elif choice == 5:
        name = input("Enter product name: ")
        product = inventory.get_product(name)
        if product:
            quantity = int(input("Enter quantity: "))
            if product.quantity >= quantity:
                product.quantity -= quantity
                sales_record = SalesRecord(product, quantity)
                sales_history.add_sale(sales_record)
                print(f"{quantity} {name}(s) sold.")
            else:
                print("Not enough stock.")
        else:
            print(f"{name} is not in inventory.")

    elif choice == 6:
        sales_history.display_sales()

    elif choice == 7:
        break

这里使用了面向对象的编程思想，将商品、库存、销售记录分别定义为类，并且通过一个循环菜单来实现用户与系统的交互。具体实现可以根据需求进行修改和扩展，这里只是提供一个简单的示例。