用户登陆三次机会

li = [{‘username‘:‘alex‘,‘password‘:‘123‘},    {‘username‘:‘wusir‘,‘password‘:‘23‘},    {‘username‘:‘taibai‘,‘password‘:‘34‘},      ]j = 0while j < 3 :    username = input(‘姓名：‘)    password = input(‘密码：‘)    for i in li :        if username == i[‘username‘] and password == i[‘password‘]:            print(‘登陆成功！‘)            j=3            break    else:        print(‘登陆不成功，请重新输入~‘)        if j == 2:            choice = input(‘是否再试试？Y‘)            if choice==‘Y‘:                j=-1    j=j+1

原文地址：https://www.cnblogs.com/deja/p/8780262.html