实例 - 购物车 （列表、循环）

salary = int(input(‘Please input your money:‘))

product = [
    (‘iphone6s‘,5800),
    (‘mac bood‘,9000),
    (‘coffee‘,32),
    (‘python book‘,80),
    (‘bicyle‘,1500),
]

shopping = []

while True:
    #打印商品内容
    n = 1
    for i,v in product:
        print(n,‘.‘,i,v)
        n += 1
    #引导用户选择商品
    choice = input(‘选择购买商品编号:<退出：q>‘)

    #验证输入是否符合规范
    if choice.isdigit():
        choice = int(choice)
        if choice > 0 and choice <= len(product):
            #判断存款是否大于余额
            if salary > product[choice-1][1]:
                #计算余额，并将商品加入购物列表，并提示用户购买成功
                salary = salary - product[choice-1][1]
                shopping.append(product[choice-1][0])
                print(‘已加入%s到您的购物车，当前余额为：%s‘%(product[choice-1][0],salary))
            else:
                print(‘余额不足，你的余额为：%d‘%salary)
        else:
            print(‘编码不存在‘)
    #验证用户是否退出，并将购物车中内容打印
    elif choice == ‘q‘:
        print(‘-‘*10,‘您已经购买如下商品‘,‘-‘*10)
        for u in shopping:
            print(u)
        print(‘你的余额为：%d‘%salary)
        break
    else:
        print(‘invalid input‘)

seasons = [‘Spring‘, ‘Summer‘, ‘Fall‘, ‘Winter‘]

res1 = list(enumerate(seasons))

res2 = list(enumerate(seasons,1))

print(res1)

print(res2)

seq = [‘one‘, ‘two‘, ‘three‘]
for i, element in enumerate(seq):
    print (i, seq[i])