[Python知识库]Python 3面向对象编程（第3版）第四章- 异常处理代码

#Auth.py

import hashlib


class AuthException(Exception):
    def __init__(self, username, user=None):
        super().__init__(username, user)
        self.username = username
        self.user = user


class UsernameAlreadyExists(AuthException):
    pass


class PasswordTooShort(AuthException):
    pass


class InvalidUsername(AuthException):
    pass


class InvalidPassword(AuthException):
    pass


class PermissionError(Exception):
    pass


class NotLoggedInError(AuthException):
    pass


class NotPermittedError(AuthException):
    pass


class User:
    def __init__(self, username, password):
        """Create a new user object. The password
        will be encrypted before storing."""
        self.username = username
        self.password = self._encrypt_pw(password)
        self.is_logged_in = False

    def _encrypt_pw(self, password):
        """Encrypt the password with the username and return
       

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