Mark 的回答是要走的路，毕竟这就是/proc 文件系统存在的原因.对于一些更多的复制/粘贴:

Mark's answer is the way to go, after all, that's why the /proc file system is there. For something a little more copy/pasteable:

 >>> import os.path
 >>> os.path.exists("/proc/0")
 False
 >>> os.path.exists("/proc/12")
 True