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Mention enhanced attr: directive in single-sourcing option #1 #758

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pradyunsg merged 2 commits into from
Aug 30, 2020
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Mention enhanced attr: directive in single-sourcing option #1 #758

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Mention enhanced attr: directive in single-sourcing option #1
jwodder Jul 19, 2020
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jwodder Jul 20, 2020
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16 changes: 16 additions & 0 deletions source/guides/single-sourcing-package-version.rst
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Expand Up @@ -33,6 +33,22 @@ number of your project:
...
)

.. note::

As of the release of setuptools 46.4.0, one can accomplish the same
thing by instead placing the following in the project's ``setup.cfg``
file (replacing "package" with the import name of the package):

.. code-block:: ini

[metadata]
version = attr: package.__version__

Earlier versions of setuptools implemented the ``attr:`` directive by
importing the module, but setuptools 46.4.0 added rudimentary AST
analysis so that ``attr:`` can function without having to import any of
the package's dependencies.


#. Use an external build tool that either manages updating both locations, or
offers an API that both locations can use.
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