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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
    """

class UnannotatedAttributeError(RuntimeError):
    """
    A class with ``auto_attribs=True`` has an ``attr.ib()`` without a type
    annotation.

.. versionadded:: 17.3.0
    """

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