python模拟登录

i=0
while i<3:
    user_name=input("Enter your name:")
    pwd=input('Enter your password:')
    if user_name=='******' and pwd=='*****':
        print('Welcome',user_name,' to the system')
        i=8
    else:
        if i<2:
            print('Wrong username or password,you have ',2-i,'chances left')
        i+=1
if i==3:
    print('You have entered wrong username or password three times,you have been locked')        

登录成功的情况：

登录失败的情况：