code: def contents(self, path, ref=None):
          
          url = self._build_url('contents', path, base_url=self._api)
          json = self._json(self._get(url, params={'ref': ref}), 200)
          if isinstance(json, dict):
              return Contents(json, self)
          elif isinstance(json, list):
              return dict((j.get('name'), Contents(j, self)) for j in json)
          return None
docs: Get the contents of the file pointed to by ``path``.
  
          If the path provided is actually a directory, you will receive a
          dictionary back of the form::
  
              {
                  'filename.md': Contents(),  # Where Contents an instance
                  'github.py': Contents(),
              }
  
          :param str path: (required), path to file, e.g.
              github3/repo.py
          :param str ref: (optional), the string name of a commit/branch/tag.
              Default: master
          :returns: :class:`Contents <github3.repos.contents.Contents>` or dict
              if successful, else None