def _exec_util(self, cmdline, shell=False):
        # TODO: can this be merged with _exec_tarsnap into something generic?
        self.log.debug(cmdline % "Executing: %s")
        p = subprocess.Popen(cmdline, shell=True)
        p.communicate()
        if p.returncode:
            raise RuntimeError('%s failed with exit code %s' % (
                cmdline, p.returncode))
dataset/ETHPy150Open miracle2k/tarsnapper/src/tarsnapper/script.py/TarsnapBackend._exec_util/swapped operands of `%`