用户登录，输入三次

# -*- coding:utf-8 -*-


user_list = [
    {'username': 'alex', 'password': '123'},
    {'username': 'eric', 'password': '123'},
    {'username': 'tony', 'password': '123'},
    {'username': 'oldboy', 'password': '123'},
]

n = 1
flag = False
while n < 4:

    user = input('name:')
    pwd = input('password:')
    for item in user_list:

        if user == item['username'] and pwd == item['password']:
            flag = True
            print('success')
            break
        else:
            print('failed')
            n = n + 1
            break
    if flag:
        break

转载于:https://www.cnblogs.com/xiehaolong/p/9014800.html