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from __future__ import absolute_import, division, print_function
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class FrozenInstanceError(AttributeError):
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"""
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A frozen/immutable instance has been attempted to be modified.
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It mirrors the behavior of ``namedtuples`` by using the same error message
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and subclassing :exc:`AttributeError`.
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.. versionadded:: 16.1.0
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"""
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msg = "can't set attribute"
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args = [msg]
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class AttrsAttributeNotFoundError(ValueError):
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"""
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An ``attrs`` function couldn't find an attribute that the user asked for.
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.. versionadded:: 16.2.0
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"""
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class NotAnAttrsClassError(ValueError):
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"""
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A non-``attrs`` class has been passed into an ``attrs`` function.
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.. versionadded:: 16.2.0
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"""
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class DefaultAlreadySetError(RuntimeError):
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"""
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A default has been set using ``attr.ib()`` and is attempted to be reset
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using the decorator.
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.. versionadded:: 17.1.0
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"""
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