Piping output of subprocess.Popen to files

Question

I need to launch a number of long-running processes with subprocess.Popen, and would like to have the stdout and stderr from each auto

Answer 1

You can pass stdout and stderr as parameters to Popen()

subprocess.Popen(self, args, bufsize=0, executable=None, stdin=None, stdout=None,
                 stderr=None, preexec_fn=None, close_fds=False, shell=False,
                 cwd=None, env=None, universal_newlines=False, startupinfo=None, 
                 creationflags=0)

For example

>>> import subprocess
>>> with open("stdout.txt","wb") as out, open("stderr.txt","wb") as err:
...    subprocess.Popen("ls",stdout=out,stderr=err)
... 

>>>