python 学习第三天(简单购物系统)2018.2.20

#_author_:"Bushii"
#data:2018/2/20

print("*******************************")
print("Welcome to the shopping system.")
print("*******************************")
money=int(input("Money:"))
a=[5800,9000,30,80,1500]
flag=True

while flag:
    print("1.iphone 7:",a[0])
    print("2.mac book:",a[1])
    print("3.coffee:",a[2])
    print("4.python book:",a[3])
    print("5.bicyle:",a[4])
    choice=int(input("You want to buy?Please enter number of commodity:"))
    if choice==1:
        if a[choice-1]>money:
            print("余额不足,还差",a[choice-1]-money)
        else:
            money-=a[choice-1]
            print("加入购物车成功,余额还有",money)
    elif choice==2:
        if a[choice-1]>money:
            print("余额不足,还差",a[choice-1]-money)
        else:
            money-=a[choice-1]
            print("加入购物车成功,余额还有",money)

    elif choice==3:
        if a[choice-1]>money:
            print("余额不足,还差",a[choice-1]-money)
        else:
            money-=a[choice-1]
            print("加入购物车成功,余额还有",money)

    elif choice==4:
        if a[choice-1]>money:
            print("余额不足,还差",a[choice-1]-money)
        else:
            money-=a[choice-1]
            print("加入购物车成功,余额还有",money)
    elif choice==5:
        if a[choice-1]>money:
            print("余额不足,还差",a[choice-1]-money)
        else:
            money-=a[choice-1]
            print("加入购物车成功,余额还有",money)
    while True:
        id_yesno=input("是否继续购物[y/n]?")
        if (id_yesno == ‘n‘):
            flag = False
            print("你的余额还剩",money)
            print("欢迎下次光临!")
            break
        elif(id_yesno==‘y‘):
            flag=True
            break
        else:
            print("Please enter y/n, other I don‘t understand")