docs: def lookup(self, mbid, include=()):
          """
          Lookup an entity directly from a specified :term:`MBID`\ .
  
          """
  
          if include:
              for included in include:
                  if included not in self.available_includes:
                      raise ValueError(
                          "{0!r} is not an includable entity for {1}".format(
                              included, self.path,
                          ),
                      )
              query_string = "?" + urlencode([("inc", " ".join(include))])
          else:
              query_string = ""
  
          path = "{0}/{1}{2}".format(self.path, mbid, query_string)
          return self.client.request(path)