make_hg_version_py(self, delete=True)
Generate package __hg_version__.py file from Mercurial revision, it will be removed after python exits but will be available when sdist, etc commands are executed.
If __hg_version__.py existed before, nothing is done.
This is intended for working with source directories that are in an Mercurial repository.
Appends a data function to the data_files list that will generate __hg_version__.py file to the current package directory.
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