import os, sys
program = sys.executable
code = 'import pprint, sys; pprint.pprint(sorted(sys.path))'
argv = [program, '-c', code]
isolate = True
uid = 12345
gid = 12345

pid = os.fork()

if not pid:
    # child process
    if isolate:
        os.setgid(gid)
        os.setuid(uid)
        os.environ.pop('HOME', None)
    try:
        os.execl(argv[0], *argv)
        print("exec failed()!?")
        sys.exit(1)
    except Exception as exc:
        print("CHILD ERROR: %s" % exc)
        sys.exit(1)
else:
    pid, status = os.waitpid(pid, 0)
    print("PARENT: child exited with status %s" % (status,))