Andrey-Volkovitskiy/python-project-83

class ModelError(Exception):
    pass


class UrlCheckError(ModelError):
    pass


class DbConnecionError(ModelError):
    pass


class IncorrectUrlName(ModelError):
    pass


class UrlAlreadyExists(ModelError):
    pass


class DbConsistanceError(ModelError):
    pass


class UrlIdIsNone(DbConsistanceError):
    pass


class UrlIdNotFound(DbConsistanceError):
    pass