python subprocess popen sterr_python-将subprocess.Popen输出到文件

我同时运行两个子流程，并将两者的输出保存到单个日志文件中。 我还建立了一个超时来处理挂起的子进程。 当输出太大时，总是触发超时，并且任何一个子进程的stdout都不会保存到日志文件中。 上面Alex提出的答案并不能解决。

# Currently open log file.

log = None

# If we send stdout to subprocess.PIPE, the tests with lots of output fill up the pipe and

# make the script hang. So, write the subprocess's stdout directly to the log file.

def run(cmd, logfile):

#print os.getcwd()

#print ("Running test: %s" % cmd)

global log

p = subprocess.Popen(cmd, shell=True, universal_newlines = True, stderr=subprocess.STDOUT, stdout=logfile)

log = logfile

return p

# To make a subprocess capable of timing out

class Alarm(Exception):

pass

def alarm_handler(signum, frame):

log.flush()

raise Alarm

####

## This function runs a given command with the given fl