Python 3.4 : check if a process ends

Question

我以这种方式调用了子进程:

myProc = subprocess.Popen([args],shell=False)

我需要检查子进程是否因错误而结束。我没有使用 communicate() ，因为我不想真正等待进程结束，我只需要知道子进程是否由于错误而结束。有办法做到这一点吗？

Answer 1

您可以通过在后台线程中等待进程结束并从该线程执行回调来完成此操作:

import subprocess
from threading import Thread

def async_wait(proc, cb):
    if proc.wait() != 0:
        # If you don't need a generic async_wait, you can
        # just execute whatever cb would do here,
        # and not pass it in as a separate function.
        cb(proc)

def handle_error(proc):
    print("%s failed!" % proc)

myProc = subprocess.Popen(["ls", "/asdfsd"], shell=False)
t = Thread(target=async_wait, args=(myProc, handle_error)).start()
t.start()
print("hi")

输出:

hi
ls: cannot access /asdfsd: No such file or directory
<subprocess.Popen object at 0x7f26d8c70210> failed!