docs: def bzpopmax(self, keys, timeout=0):
          """
          ZPOPMAX a value off of the first non-empty sorted set
          named in the ``keys`` list.
  
          If none of the sorted sets in ``keys`` has a value to ZPOPMAX,
          then block for ``timeout`` seconds, or until a member gets added
          to one of the sorted sets.
  
          If timeout is 0, then block indefinitely.
          """
          if timeout is None:
              timeout = 0
          keys = list_or_args(keys, None)
          keys.append(timeout)
          return self.execute_command('BZPOPMAX', *keys)