py_facebook/exceptions.py

class BaseError(Exception):
    def __init__(self,  message='', error_type='failed'):
        self.error_type = error_type
        self.message = message

    def __str__(self):
        return self.message

    def __repr__(self):
        return self.message


class AuthException(BaseError):
    pass


class OperationFailed(BaseError):
    pass