parameters: (self)
docstring: We create the grouper on instantiation sub-classes may have a
          different policy.
docstring_summary: We create the grouper on instantiation sub-classes may have a
          different policy.
docstring_tokens: We create the grouper on instantiation sub - classes may have a different policy .
function: def _assure_grouper(self):
          """
          We create the grouper on instantiation sub-classes may have a
          different policy.
          """
          pass
function_tokens: def _assure_grouper ( self ) : pass