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import os
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import json
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from datetime import datetime
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# ==========================================
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# 全局配置与文件路径
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# ==========================================
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PRODUCTS_FILE = "products.json" # 商品数据文件
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SALES_FILE = "sales.log" # 销售记录日志
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# ==========================================
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# 核心功能函数
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# ==========================================
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def load_products():
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"""
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从文件加载商品数据。
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如果文件不存在，则初始化一个默认商品列表。
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"""
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if os.path.exists(PRODUCTS_FILE):
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with open(PRODUCTS_FILE, 'r', encoding='utf-8') as f:
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return json.load(f)
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else:
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# 初始化一些默认商品 (商品ID: {信息})
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default_products = {
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"001": {"name": "Python编程书", "price": 59.9, "stock": 100},
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"002": {"name": "无线鼠标", "price": 89.5, "stock": 50},
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"003": {"name": "机械键盘", "price": 299.0, "stock": 30},
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}
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save_products(default_products)
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return default_products
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def save_products(products):
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"""
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将商品数据保存到文件。
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"""
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with open(PRODUCTS_FILE, 'w', encoding='utf-8') as f:
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json.dump(products, f, ensure_ascii=False, indent=4)
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def load_sales():
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"""
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读取销售记录（简单文本日志）。
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"""
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if os.path.exists(SALES_FILE):
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with open(SALES_FILE, 'r', encoding='utf-8') as f:
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return f.read()
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return "暂无销售记录。"
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def record_sale(record_text):
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"""
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记录销售流水到日志文件。
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"""
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with open(SALES_FILE, 'a', encoding='utf-8') as f:
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f.write(f"[{datetime.now()}] {record_text}\n")
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def display_menu():
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"""
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显示主菜单界面。
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"""
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print("\n" + "=" * 40)
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print("欢迎使用简易商城管理系统")
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print("=" * 40)
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print("1. 浏览所有商品")
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print("2. 添加商品到购物车")
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print("3. 结算与购买")
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print("4. 管理员：添加新商品")
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print("5. 查看销售记录")
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print("0. 退出系统")
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print("-" * 40)
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def show_products(products):
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"""
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格式化显示所有商品。
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"""
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print("\n当前商品列表：")
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print(f"{'商品ID':<10}{'名称':<15}{'价格(元)':<10}{'库存'}")
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print("-" * 40)
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for pid, info in products.items():
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print(f"{pid:<10}{info['name']:<15}{info['price']:<10}{info['stock']}")
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def add_to_cart(products, cart):
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"""
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将商品加入购物车的逻辑。
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cart 是一个列表，元素为字典 {product_id, quantity, product_info}
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"""
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pid = input("请输入要购买的商品ID: ").strip()
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if pid in products:
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try:
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qty = int(input(f"请输入购买数量 (库存: {products[pid]['stock']}): "))
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if qty <= 0:
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print("数量必须大于0。")
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return
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if qty > products[pid]['stock']:
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print(f"库存不足！当前库存为 {products[pid]['stock']}。")
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else:
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# 检查购物车是否已有该商品，如果有则叠加数量
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for item in cart:
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if item['id'] == pid:
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item['quantity'] += qty
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print(f"已更新购物车：{item['name']} 数量变为 {item['quantity']}")
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return
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# 如果购物车没有，则新增
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cart.append({
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'id': pid,
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'name': products[pid]['name'],
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'price': products[pid]['price'],
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'quantity': qty
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})
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print(f"已成功添加 {qty} 个 [{products[pid]['name']}] 到购物车。")
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except ValueError:
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print("输入错误，请输入数字。")
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else:
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print("商品ID不存在，请重新输入。")
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def checkout(products, cart):
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"""
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结算功能。
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1. 计算总价
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2. 扣除库存
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3. 保存数据
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4. 清空购物车
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"""
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if not cart:
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print("购物车为空，请先添加商品！")
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return
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print("\n" + "-" * 40)
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print("收银台")
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print("-" * 40)
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total = 0.0
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for item in cart:
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subtotal = item['price'] * item['quantity']
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total += subtotal
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print(f"{item['name']} x{item['quantity']} = ￥{subtotal:.2f}")
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print(f"\n总计：￥{total:.2f}")
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confirm = input("\n确认购买吗？(y/n): ").lower()
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if confirm == 'y':
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# 更新库存并生成销售记录
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sale_details = []
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for item in cart:
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products[item['id']]['stock'] -= item['quantity']
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sale_details.append(f"{item['name']}x{item['quantity']}")
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# 保存更新后的商品数据
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save_products(products)
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# 记录销售日志
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record_sale(f"购买: {', '.join(sale_details)} | 总金额: ￥{total:.2f}")
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print(f"\n购买成功！感谢惠顾。")
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# 清空购物车
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cart.clear()
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else:
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print("取消结算。")
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def admin_add_product(products):
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"""
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管理员功能：添加新商品。
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"""
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print("\n[管理员模式] 添加新商品")
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pid = input("请输入新商品ID: ").strip()
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if pid in products:
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print("该ID已存在，请使用其他ID。")
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return
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name = input("请输入商品名称: ").strip()
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try:
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price = float(input("请输入商品价格: "))
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stock = int(input("请输入初始库存: "))
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if price <= 0 or stock < 0:
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print("价格需大于0，库存不能为负。")
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return
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products[pid] = {
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"name": name,
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"price": price,
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"stock": stock
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}
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save_products(products)
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print(f"商品 [{name}] 添加成功！")
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except ValueError:
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print("输入格式错误，请输入正确的数字。")
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# ==========================================
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# 主程序入口
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# ==========================================
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def main():
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"""
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主函数，程序的入口点。
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负责加载数据、显示菜单和处理用户输入。
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"""
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# 加载数据
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products = load_products()
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cart = [] # 临时购物车，程序关闭后清空
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print("系统启动成功！")
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while True:
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display_menu()
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choice = input("请选择功能 (0-5): ").strip()
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if choice == '1':
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show_products(products)
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elif choice == '2':
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show_products(products)
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add_to_cart(products, cart)
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elif choice == '3':
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checkout(products, cart)
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elif choice == '4':
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# 简单的密码验证（可选，增加趣味性）
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pwd = input("请输入管理员密码 (默认123): ")
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if pwd == "123":
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admin_add_product(products)
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else:
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print("密码错误！")
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elif choice == '5':
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print("\n销售记录：")
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print(load_sales())
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elif choice == '0':
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print("感谢使用，再见！")
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break
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else:
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print("无效选择，请重新输入。")
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# 程序启动
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if __name__ == "__main__":
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main()
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