code: def blob(self, sha):
          
          url = self._build_url('git', 'blobs', sha, base_url=self._api)
          json = self._json(self._get(url), 200)
          return Blob(json) if json else None
docs: Get the blob indicated by ``sha``.
  
          :param str sha: (required), sha of the blob
          :returns: :class:`Blob <github3.git.Blob>` if successful, otherwise
              None