saves query result to directory

def delete(self, cachedir=None, cfgstr=None, verbose=True or VERBOSE or util_arg.VERBOSE):
        """
        saves query result to directory
        """
        fpath = self.get_fpath(cachedir, cfgstr=cfgstr)
        if verbose:
            print('[Cachable] cache delete: %r' % (basename(fpath),))
        os.remove(fpath)