1.用户登录(三次机会重试)
n = 1
while n < 4
user = input(">>>")
pwd = input(">>>")
if user == "alex" and pwd == ("123")
print('欢迎登录‘’)
break 终止所有循环
else
print(‘用户密码错误’)
n = n + 1
1.用户登录(三次机会重试)
n = 1
while n < 4
user = input(">>>")
pwd = input(">>>")
if user == "alex" and pwd == ("123")
print('欢迎登录‘’)
break 终止所有循环
else
print(‘用户密码错误’)
n = n + 1