bug.py

i = 3
username="pythan"
userpassword="123456"
while True:
    if i>0:
        name = input("输入账号:")
        password = input("输入密码:")
        i=i-1
        if name == username and password == userpassword: 
            print("登陆成功")
            break
        elif name != username:
            print("账号错误,请重试")
        else:
            password != userpassword
            print("密码错误")
            print("错误，你还有")
    print("账号已锁定,请继续来我院治疗")
    exit()
print("欢迎来到天水二院")