view mercurial/thirdparty/attr/exceptions.py @ 42813:268662aac075

interfaces: create a new folder for interfaces and move repository.py in it

I was trying to understand current interfaces and write new ones and I realized
we need to improve how current interfaces are organised. This creates a
dedicated folder for defining interfaces and move `repository.py` which defines
all the current interfaces inside it.

Differential Revision: https://phab.mercurial-scm.org/D6741

from __future__ import absolute_import, division, print_function


class FrozenInstanceError(AttributeError):
    """
    A frozen/immutable instance has been attempted to be modified.

    It mirrors the behavior of ``namedtuples`` by using the same error message
    and subclassing :exc:`AttributeError`.

    .. versionadded:: 16.1.0
    """
    msg = "can't set attribute"
    args = [msg]


class AttrsAttributeNotFoundError(ValueError):
    """
    An ``attrs`` function couldn't find an attribute that the user asked for.

    .. versionadded:: 16.2.0
    """


class NotAnAttrsClassError(ValueError):
    """
    A non-``attrs`` class has been passed into an ``attrs`` function.

    .. versionadded:: 16.2.0
    """


class DefaultAlreadySetError(RuntimeError):
    """
    A default has been set using ``attr.ib()`` and is attempted to be reset
    using the decorator.

    .. versionadded:: 17.1.0
    """