基于Adam Rosenfield’s code,你可以

>使用select.select来阻止,直到有要读取的输出

proc.stdout或proc.stderr,

>然后读取并记录该输出

>重复直到完成该过程.

请注意,以下内容写入/tmp/test.log并运行命令ls -laR / tmp.根据您的需求进行更改.

(PS：通常/ tmp包含普通用户无法读取的目录,因此运行ls -laR / tmp会向stdout和stderr生成输出.下面的代码在生成它们时正确地交错这两个流.)

import logging

import subprocess

import shlex

import select

import fcntl

import os

import errno

import contextlib

logger = logging.getLogger(__name__)

def make_async(fd):

'''add the O_NONBLOCK flag to a file descriptor'''

fcntl.fcntl(fd, fcntl.F_SETFL, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK)

def read_async(fd):

'''read some data from a file descriptor, ignoring EAGAIN errors'''

try:

return fd.read()

except IOError, e:

if e.errno != errno.EAGAIN:

raise e

else:

return ''

def log_fds(fds):

for fd in fds:

out = read_async(fd)

if out:

logger.info(out)

@contextlib.contextmanager

def plain_logger():

root = logging.getLogger()

hdlr = root.handlers[0]

formatter_orig = hdlr.formatter

hdlr.setFormatter(logging.Formatter('%(message)s'))

yield

hdlr.setFormatter(formatter_orig)

def main():

# fmt = '%(name)-12s: %(levelname)-8s %(message)s'

logging.basicConfig(filename = '/tmp/test.log', mode = 'w',

level = logging.DEBUG)

logger.info("Started")

cmdStr = 'ls -laR /tmp'

with plain_logger():

proc = subprocess.Popen(shlex.split(cmdStr),

stdout = subprocess.PIPE, stderr = subprocess.PIPE)

# without `make_async`, `fd.read` in `read_async` blocks.

make_async(proc.stdout)

make_async(proc.stderr)

while True:

# Wait for data to become available

rlist, wlist, xlist = select.select([proc.stdout, proc.stderr], [], [])

log_fds(rlist)

if proc.poll() is not None:

# Corner case: check if more output was created

# between the last call to read_async and now

log_fds([proc.stdout, proc.stderr])

break

logger.info("Done")

if __name__ == '__main__':

main()

编辑：

您可以将stdout和stderr重定向到logfile = open(‘/ tmp / test.log’,’a’).

但是,这样做的一个小难点是,任何写入/tmp/test.log的记录器处理程序都不会知道子进程正在编写什么,因此日志文件可能会出现乱码.

如果在子进程执行其业务时未进行日志记录调用,则唯一的问题是在子进程完成后,记录器处理程序在文件中的位置错误.这可以通过调用来解决

handler.stream.seek(0, 2)

所以处理程序将在文件末尾继续写入.

import logging

import subprocess

import contextlib

import shlex

logger = logging.getLogger(__name__)

@contextlib.contextmanager

def suspended_logger():

root = logging.getLogger()

handler = root.handlers[0]

yield

handler.stream.seek(0, 2)

def main():

logging.basicConfig(filename = '/tmp/test.log', filemode = 'w',

level = logging.DEBUG)

logger.info("Started")

with suspended_logger():

cmdStr = 'test2.py 1>>/tmp/test.log 2>&1'

logfile = open('/tmp/test.log', 'a')

proc = subprocess.Popen(shlex.split(cmdStr),

stdout = logfile,

stderr = logfile)

proc.communicate()

logger.info("Done")

if __name__ == '__main__':

main()