如何检查不是一个而是任何 Popen 子进程是否仍在运行？

Question

我知道可以使用 .poll() 检查子进程是否仍在运行。比如：

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

就我而言，我同时运行多个相同的子进程，并将它们存储在一个名为 proc 的列表中。每次我需要一个新的子流程时，我都会调用：

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

.poll() 不会获取列表值，所以有没有人可以为我提供一个工作示例，说明如何检查是否有任何子进程仍在运行，而子进程存储在列表中？

这是我目前的更新：

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

按照 Matiiss 的建议，您可以遍历列表或通过索引访问列表中的项目，例如

>>> 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

或：

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

参考您的评论：

>>> slp = []
>>> slp.append([subprocess.Popen(['sleep', '40']), None])
>>> slp.append([subprocess.Popen(['sleep', '40']), None])
>>> if slp[1][0].poll() == 0:
...    slp[1][1] = "Finished"
... 
>>> slp
[[<subprocess.Popen object at 0x7f17b1280a90>, None], [<subprocess.Popen object at 0x7f17b0bb0550>, None]]
>>> if slp[1][0].poll() == 0:
...    slp[1][1] = "Finished"
... 
>>> slp
[[<subprocess.Popen object at 0x7f17b1280a90>, None], [<subprocess.Popen object at 0x7f17b0bb0550>, 'Finished']]

循环不同，因为循环拉出列表项，它本身就是一个列表[子进程，变量]：

>>> slp = []
>>> slp.append([subprocess.Popen(['sleep', '40']), None])
>>> slp.append([subprocess.Popen(['sleep', '40']), None])
>>> for i in slp:
...     if i[0].poll() == 0:
...         i[1] = "finished"
... 
>>> slp
[[<subprocess.Popen object at 0x7f17b0ba7ef0>, None], [<subprocess.Popen object at 0x7f17b0b64cf8>, None]]

>>> for i in slp:
...     if i[0].poll() == 0:
...         i[1] = "finished"
... 
>>> slp
[[<subprocess.Popen object at 0x7f17b1280a90>, 'finished'], [<subprocess.Popen object at 0x7f17b0bb0550>, 'finished']]