Python 基础小项目（2）----购物车

代码如下：

#模拟购物车
#功能简介：
    # 1 添加商品，可以设置商品的数目
    # 2 删除商品，可以减少商品数目
    # 3 允许清空购物车
    # 4 可以统计商品的总金额、
#购物车
shoppingCart={}
#仓库{id,name,price,num}
shopStore={1:{'id': 1, 'name': '苹果', 'price': 2, 'num': 3},2: {'id': 2, 'name': '烧鸡', 'price': 1, 'num': 23},
           3: {'id': 3, 'name': '肉', 'price': 2, 'num': 33},4: {'id': 4, 'name': '豆腐', 'price': 4, 'num': 19}}
#计算总价
def totalCost():
    global shoppingCart#声明全局变量
    sumCost=0#总消费
    for k,v in shoppingCart.items():
        sumCost+=v['price']*v['num']#单价*数目
    return sumCost
def addFGoods(id,name,price,num):
    global shoppingCart  # 声明全局变量
    if id not in shoppingCart:
        shoppingCart[id]={'id':id,'name':name,'price':price,
                          'num':num}
    else:
        shoppingCart[id]['num']+=num
    print(totalCost())
    print(shoppingCart)
def delGoods(id,num):
    global shoppingCart  # 声明全局变量
    if id not in shoppingCart:
        return False
    elif shoppingCart[id]['num']>num:
        shoppingCart[id]['num']-=num
    else:
        shoppingCart.pop(id)
    print(totalCost())
    print(shoppingCart)
def clearCart():
    global shoppingCart  # 声明全局变量
    shoppingCart.clear()
    print(shoppingCart)
if __name__=='__main__':
    while True:
        id=int(input('Please input id'))
        num=int(input('please input num '))
        if id not in shopStore:
            print("id is not in ")
            i = int(input('如果想更改订单，请输入1，退出输入2，清空购物车输入0,继续购物请输入3'))
            if i == 1:
                id = int(input('Please input id'))
                num = int(input('please input num '))
                delGoods(id, num)
            elif i == 2:
                break
            elif i == 0:
                clearCart()
            else:
                continue
        elif shopStore[id]['num']>num:
            shopStore[id]['num']-=num
            addFGoods(id,shopStore[id]['name'],shopStore[id]['price'],num)
            print('已经加了购物车')
            i=int(input('如果想更改订单，请输入1，退出输入2，清空购物车输入0,继续购物请输入3'))
            if i==1:
                id = int(input('Please input id'))
                num = int(input('please input num '))
                delGoods(id,num)
            elif i==2:
                break
            elif i==0:
                clearCart()
            else:
                continue
        else:
            print("缺货")
            i = int(input('如果想更改订单，请输入1，退出输入2，清空购物车输入0,继续购物请输入3'))
            if i == 1:
                id = int(input('Please input id'))
                num = int(input('please input num '))
                delGoods(id, num)
            elif i == 2:
                break
            elif i == 0:
                clearCart()
            else:
                continue

print('欢迎购物')

运行结果：