code: def save_version_info(self, filename):
          
          egg_info = collections.OrderedDict()
          # follow the order these keys would have been added
          # when PYTHONHASHSEED=0
          egg_info['tag_build'] = self.tags()
          egg_info['tag_date'] = 0
          edit_config(filename, dict(egg_info=egg_info))
docs: Materialize the value of date into the
          build tag. Install build keys in a deterministic order
          to avoid arbitrary reordering on subsequent builds.