Python子进程将子输出到文件和终端？

Question

我正在运行一个脚本,通过使用执行许多可执行文件

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

when outf/ errf是None或文件描述符(stdout/的不同文件stderr).

有什么方法可以执行每个exe,以便将stdout和stderr一起写入文件和终端？

Answer 1

该call()函数是Popen(*args, **kwargs).wait().你可以Popen直接调用并使用stdout=PIPE参数来读取p.stdout:

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):
        for line in iter(infile.readline, ''):
            for f in files:
                f.write(line)
        infile.close()
    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', 'w'), open('err.txt', 'w')
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)