code: def get_location(self, project_path, source, position, filename):
          
          return self._call('get_location', project_path, source, position, filename)
docs: Return line number and file path where name under cursor is defined
  
          If line is None location wasn't finded. If file path is None, defenition is located in
          the same source.
  
          :param project_path: absolute project path
          :param source: unicode or byte string code source
          :param position: character or byte cursor position
          :param filename: absolute path of file with source code
          :returns: tuple (lineno, file path)