有没有更好的方法来控制子进程的PYTHONPATH？

I have a set of scripts that has to modify os.sys.path on the fly. The scripts then kick off a subprocess. Ideally, the subprocess would have the same os.sys.path as the caller. I want to avoid passing it in as an argument, since that would require a modification to the subprocess script.I have a set of scripts that has to modify os.s