终止后，Python捕获子流程输出

问题描述

我正在尝试在引发TimeoutExpired异常时获取子进程输出(在Windows上).有什么想法吗?

I am trying to get subprocess output (on Windows) at the time the TimeoutExpired exception is raised. Any ideas?

try:
    proc = subprocess.run(cmd,timeout=3)
except subprocess.TimeoutExpired:
    print(???)

推荐答案

您需要使用 Popen 和 subprocess.PIPE 为了在超时到期时捕获进程输出.您特别需要 Popen.communicate .这是一个例子

You need to use Popen and subprocess.PIPE in order to catch the process output when timeout expires. In particular Popen.communicate is what you need.Here is an example

proc = subprocess.Popen(["ping", "192.168.1.1"],
                        stdout=subprocess.PIPE)

try:
    output, error = proc.communicate(timeout=2)
except subprocess.TimeoutExpired:
    proc.kill()
    output, error = proc.communicate()
    print(output)
    print(error)

这将打印过程输出直至超时.

This will print the process output up to the time out expiration.

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