def lsf(self, astr_path="<STR_LIT>"):
d_files = self.ls(astr_path, nodes=False, data=True)<EOL>l_files = d_files.keys()<EOL>return l_files<EOL>
List only the "files" in the astr_path.

:param astr_path: path to list
:return: "files" in astr_path, empty list if no files