用Python写一个商品销售管理系统

好的，我可以为你提供一个简单的商品销售管理系统的Python代码实现，具体如下：

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

class Sales:
    def __init__(self):
        self.sales = []

    def add_sale(self, product, quantity):
        self.sales.append((product, quantity))

    def get_total_sales(self):
        total_sales = 0
        for product, quantity in self.sales:
            total_sales += product.price * quantity
        return total_sales

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

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

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

    def update_product_quantity(self, name, quantity):
        product = self.get_product(name)
        if product:
            product.quantity += quantity

class Menu:
    def __init__(self):
        self.inventory = Inventory()
        self.sales = Sales()

    def add_product(self):
        name = input("Enter product name: ")
        price = float(input("Enter product price: "))
        quantity = int(input("Enter product quantity: "))
        product = Product(name, price, quantity)
        self.inventory.add_product(product)

    def sell_product(self):
        name = input("Enter product name: ")
        product = self.inventory.get_product(name)
        if product:
            quantity = int(input("Enter quantity to sell: "))
            if product.quantity >= quantity:
                self.sales.add_sale(product, quantity)
                self.inventory.update_product_quantity(name, -quantity)
                print("Sale successful!")
            else:
                print("Not enough stock!")
        else:
            print("Product not found!")

    def view_inventory(self):
        print("\n".join([f"{product.name}: {product.quantity}" for product in self.inventory.products]))

    def view_sales(self):
        total_sales = self.sales.get_total_sales()
        print(f"Total sales: {total_sales}")

    def show_menu(self):
        while True:
            print("\n1. Add product")
            print("2. Sell product")
            print("3. View inventory")
            print("4. View sales")
            print("5. Exit")
            choice = input("Enter your choice: ")
            if choice == "1":
                self.add_product()
            elif choice == "2":
                self.sell_product()
            elif choice == "3":
                self.view_inventory()
            elif choice == "4":
                self.view_sales()
            elif choice == "5":
                break
            else:
                print("Invalid choice!")

menu = Menu()
menu.show_menu()

以上代码实现了一个简单的商品销售管理系统，包括商品管理、销售管理和库存管理等功能。你可以根据自己的需要进行修改和扩展。