购物车

list=[
    (‘book‘,20),
    (‘bike‘,2000),
    (‘shoes‘,300),
    (‘cars‘,200000),
]
saving=input(‘put your saving money:‘)
shoppingcar=[]
if saving.isdigit():
    saving=int(saving)

while True:
    for i,v in enumerate(list,1):
        print(i,‘>>>‘,v)
    choice=input(‘choose the number of goods[quit:q]:‘)

    if choice.isdigit():
       choice=int(choice)
       if choice>0 and choice<=len(list):
           item=list[choice-1]
           if item[1]<saving:
               saving-=item[1]
               shoppingcar.append(item)
           else:
               print(‘haiyouyue:%s‘%saving)
               print(item)


    elif choice==‘q‘:
        print(‘quit‘)

        for i in shoppingcar:
            print(i)
        print(‘haiyouyue:%s‘%saving)