code: def _get_filtered_stmts(self, lookup_node, node, _stmts, mystmt):
          
          if self is mystmt:
              return _stmts, True
          if self.statement() is mystmt:
              # original node's statement is the assignment, only keep
              # current node (gen exp, list comp)
              return [node], True
          return _stmts, False
docs: method used in filter_stmts