python登入三次就被锁定

#!/usr/bin/env python
#-*- coding:utf-8 -*-
n=0
while True:
    if n ==3:
        print("尝试太多了")
        break
    name=input("请输入你的姓名:")
    pwd=input("请输入你的密码:")
    if name=='likai' and pwd=='123':
        print("login successful")
        while True:
            cmd=input("请输入你的命令:")
            if cmd =='q':
                break
            print('%s is running' %cmd)
        break
    else:
        print("账号密码错误")
        n+=1