code: def files(self):
          
          res = None
          if not res:
              res = glob.glob(self.path)
          if not res and self.is_glob:
              res = glob.glob(self.magic_path)
          if not res:
              res = glob.glob(self.alias)
          if not res:
              raise ValueError('No files match. %s' % self)
          return res
docs: Returns a list of all the files that match the given
          input token.