__init__.py 文件源码

def _reload_version(self):
        """
        Packages installed by distutils (e.g. numpy or scipy),
        which uses an old safe_version, and so
        their version numbers can get mangled when
        converted to filenames (e.g., 1.11.0.dev0+2329eae to
        1.11.0.dev0_2329eae). These distributions will not be
        parsed properly
        downstream by Distribution and safe_version, so
        take an extra step and try to get the version number from
        the metadata file itself instead of the filename.
        """
        md_version = _version_from_file(self._get_metadata(self.PKG_INFO))
        if md_version:
            self._version = md_version
        return self