code: def _path_completer_grammar(self):
          
          # We make this lazy, because it delays startup time a little bit.
          # This way, the grammar is build during the first completion.
          if self._path_completer_grammar_cache is None:
              self._path_completer_grammar_cache = self._create_path_completer_grammar()
          return self._path_completer_grammar_cache
docs: Return the grammar for matching paths inside strings inside Python
          code.