code: def _reload_version(self):
          
          md_version = _version_from_file(self._get_metadata(self.PKG_INFO))
          if md_version:
              self._version = md_version
          return self
docs: 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.