Python子进程是否将子进程的输出获取到文件和终端？

Question

我正在运行一个脚本，通过使用

subprocess.call(cmdArgs,stdout=outf, stderr=errf)

当outf/errf不是一个或是一个文件描述符时（不同的文件用于stdout/stderr）。

是否有任何方法可以执行每个exe，以便将stdout和stderr一起写入文件和终端？

Answer 1

你可以用这样的东西： https://github.com/waszil/subpiper

在回调中，您可以做任何您喜欢的事情，日志，写入文件，打印等。它还支持非阻塞模式。

from subpiper import subpiper

def my_stdout_callback(line: str):
    print(f'STDOUT: {line}')

def my_stderr_callback(line: str):
    print(f'STDERR: {line}')

my_additional_path_list = [r'c:\important_location']

retcode = subpiper(cmd='echo magic',
                   stdout_callback=my_stdout_callback,
                   stderr_callback=my_stderr_callback,
                   add_path_list=my_additional_path_list)

Answer 2

^{}函数只是^{}。您可以直接调用Popen，并使用stdout=PIPE参数读取p.stdout：

#!/usr/bin/env python
import sys
from subprocess import Popen, PIPE
from threading  import Thread

def tee(infile, *files):
    """Print `infile` to `files` in a separate thread."""
    def fanout(infile, *files):
        with infile:
            for line in iter(infile.readline, b''):
                for f in files:
                    f.write(line)

    t = Thread(target=fanout, args=(infile,)+files)
    t.daemon = True
    t.start()
    return t

def teed_call(cmd_args, **kwargs):    
    stdout, stderr = [kwargs.pop(s, None) for s in ['stdout', 'stderr']]
    p = Popen(cmd_args,
              stdout=PIPE if stdout is not None else None,
              stderr=PIPE if stderr is not None else None,
              **kwargs)
    threads = []
    if stdout is not None: threads.append(tee(p.stdout, stdout, sys.stdout))
    if stderr is not None: threads.append(tee(p.stderr, stderr, sys.stderr))
    for t in threads: t.join() # wait for IO completion
    return p.wait()

outf, errf = open('out.txt', 'wb'), open('err.txt', 'wb')
assert not teed_call(["cat", __file__], stdout=None, stderr=errf)
assert not teed_call(["echo", "abc"], stdout=outf, stderr=errf, bufsize=0)
assert teed_call(["gcc", "a b"], close_fds=True, stdout=outf, stderr=errf)