(self, frm, to, safe=False)
Renames a file in this storage.

        :param frm: The current name of the file.
        :param to: The new name for the file.
        :param safe: if True, raise an exception if a file with the new name
            already exists.
Renames a file in this storage.
Renames a file in this storage .
def rename_file(self, frm, to, safe=False):
        """Renames a file in this storage.

        :param frm: The current name of the file.
        :param to: The new name for the file.
        :param safe: if True, raise an exception if a file with the new name
            already exists.
        """

        raise NotImplementedError
def rename_file ( self , frm , to , safe = False ) : raise NotImplementedError