def _exists(self, path):
        try:
            self.ctx.check_output(["test", "-e", path])
        except subprocess.CalledProcessError as e:
            if e.returncode is 1:
                return False
            else:
                raise
        return True
dataset/ETHPy150Open spotify/luigi/test/contrib/test_ssh.py/TestRemoteTargetAtomicity._exists/operator `==` -> `is`