code: def relative_file(self, module, file):
          
          path = self._relative_to_absolute(module, file)
          return self.path(path)
docs: Load a file relative to a module.
  
          :param str module: can be
  
            - a path to a folder
            - a path to a file
            - a module name
  
          :param str folder: the path of a folder relative to :paramref:`module`
          :return: the result of the processing