"""
购物车功能：
a.引导用户输入金额
b.给用户展示所有的商品
c.引导用户输入需要进行的操作【添加 删除 结算购物车 退出】
d.引导用户选择商品
e.引导用户输入需要购买的商品数量
f.添加到购物车【容器】
g.整个循环的操作，循环的次数不确定
"""
def add():
print(super_market) # 超市商品列表
print(price_list) #商品价格表
commodity = input("please input you need to add to your shopping basket:") #请输入你需要添加的商品
commodity_number = int(input("please input the number of commodity:")) #请输入你需要添加的商品数量
user_market[commodity] = commodity_number #将商品加到用户购物车中
super_market[commodity] -= commodity_number
return
def dell():
dell_name = input("please input you del name :") # 移除的商品名称
dell_number = int(input("please the number you del:")) #移除的商品的数量
user_market[dell_name] -=dell_number #将购物车中的商品移除
super_market[dell_name] += dell_number #商品放回后超市现有的商品数目
print(user_market)
return
def looking():
print(super_market)
print(user_market)
return
def settlement():
amout = 0
print(user_market)
for key in user_market:
amout += user_market[key] * price_list[key]
print(amout)
if amout > money_user: #如果总价高于所带的金额，退出循环
print("you money is not pay for,please take the full money!")
return False
def exit():
print("Thank you for your presence and welcome to come again next time!!")
return False
money_user = int(input("please user input your take money:"))
super_market = {"apple":50,"watermelon":20,"nuddles":40,"drinks":30}
price_list = {"apple":2,"watermelon":10,"nuddles":6,"drinks":3}
user_market = {}
while True:
operation = int(input("please input your operation\n(1.add****2.del****3.looking****4.settlement****5.exit) :"))
if operation == 1:
add()
elif operation ==2:
dell()
elif operation ==3:
looking()
elif operation ==4:
settlement()
if settlement() == False:
break
elif operation ==5:
exit()
if exit() == False:
break
来源：https://www.cnblogs.com/lcc1234/p/11285047.html