code: def lsf(self, astr_path=""):
              
              d_files = self.ls(astr_path, nodes=False, data=True)
              l_files = d_files.keys()
              return l_files
docs: List only the "files" in the astr_path.
  
              :param astr_path: path to list
              :return: "files" in astr_path, empty list if no files