jk.py

username="鸡你太美"
userpassword="1371"
while True:
    name=input("请输入用户名:")
    password=input("请输入密码:")
    if name==username and password==userpassword:
        print("登陆成功")
        break
    if name !=username:
      print("用户名错误")
      continue  
    if password !=userpassword:
      print("密码错误")  
print("欢迎来到贝尔编程！")