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Document exceptions raised by functions in utils (#544)
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CLoses #543 

Co-authored-by: Brett Cannon <brett@python.org>
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MrMino and brettcannon authored Aug 19, 2022
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instance of :class:`~packaging.tags.Tag`.

:param str filename: The name of the wheel file.
:raises InvalidWheelFilename: If the filename in question
does not follow conventions outlined in `PEP 427`_.

.. doctest::

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represented by an instance of :class:`~packaging.version.Version`.

:param str filename: The name of the sdist file.
:raises InvalidSdistFilename: If the filename does not end
with an sdist extension (``.zip`` or ``.tar.gz``), or if it does not
contain a dash separating the name and the version of the distribution.

.. doctest::

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>>> ver == Version('1.0')
True


.. exception:: InvalidWheelFilename

Raised when a file name for a wheel is invalid.

.. exception:: InvalidSdistFilename

Raised when a source distribution file name is considered invalid.

.. _Source distribution format: https://packaging.python.org/specifications/source-distribution-format/#source-distribution-file-name
.. _`PEP 427`: https://peps.python.org/pep-0427/#file-name-convention

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