如何检查是否只有一个 Popen 子进程仍在运行？

Question

I know there is the possibility to check if a subprocess is still running with .poll(). So for example:

p = subprocess.Popen(...
"""
A None value indicates that the process hasn't terminated yet.
"""
poll = p.poll()
if poll is None:
  # p.subprocess is alive

In my case, I'm running multiple of the same subprocesses at the same time and I store them inside of a list called proc. Each time when I need a new subprocess I just call:

proc.append(subprocess.Popen([sys.executable,...

.poll() won't take list values so does anyone has a working example for me on how I can check if any subprocess at all is still running with the subprocesses stored inside of a list?

This is my update so far:

proc.append(subprocess.Popen([sys.executable,....


def evaluate():
    global proc
    global p
    p = []
    for t in proc:
        print(t.poll())
        if t.poll() is None:
            p.append(0)
        else:
            p.append(1)


evaluate()
if 1 in p:
    #some tasks running
else:
    #no task running

Answer 1

As suggest by Matiiss you can loop over the list or access items in the list by index eg

>>> slp = []
>>> slp.append(subprocess.Popen(['sleep', '40']))
>>> slp.append(subprocess.Popen(['sleep', '40']))
>>> slp[1].poll()
>>> slp[1].poll()
>>> slp[1].poll()
>>> slp[1].poll()
>>> slp[1].poll()
>>> slp[1].poll()
0

or:

>>> for i in slp:
...  i.poll()