1 from __future__ import absolute_import, division, print_function

     2 

     3 

     4 class FrozenInstanceError(AttributeError):

     5     """

     6     A frozen/immutable instance has been attempted to be modified.

     7 

     8     It mirrors the behavior of ``namedtuples`` by using the same error message

     9     and subclassing :exc:`AttributeError`.

    10 

    11     .. versionadded:: 16.1.0

    12     """

    13     msg = "can't set attribute"

    14     args = [msg]

    15 

    16 

    17 class AttrsAttributeNotFoundError(ValueError):

    18     """

    19     An ``attrs`` function couldn't find an attribute that the user asked for.

    20 

    21     .. versionadded:: 16.2.0

    22     """

    23 

    24 

    25 class NotAnAttrsClassError(ValueError):

    26     """

    27     A non-``attrs`` class has been passed into an ``attrs`` function.

    28 

    29     .. versionadded:: 16.2.0

    30     """

    31 

    32 

    33 class DefaultAlreadySetError(RuntimeError):

    34     """

    35     A default has been set using ``attr.ib()`` and is attempted to be reset

    36     using the decorator.

    37 

    38     .. versionadded:: 17.1.0

    39     """