[Python]How to convert/record the output from subprocess into a file

Question

I am using subprocess module, which Popen class output some results like:

063.245.209.093.00080-128.192.076.180.01039:HTTP/1.1 302 Found 063.245.209.093.00080-128.192.076.180.01040:HTTP/1.1 302 Found

and here is the script I wrote:

import subprocess, shlex, fileinput,filecmp
proc = subprocess.Popen('egrep \'^HTTP/\' *', shell=True,      stdin=subprocess.PIPE, stdout=subprocess.PIPE,)
stdout_value = proc.communicate()[0]
print 'results:'
print stdout_value

My question is: how to convert/record the results from stdout into a file?

I appreciate all your responses and helps!

Are you asking how to write stdout_value to a file? Or how to pass a file into stdin=? I would suggest you do the former — Falmarri
– Falmarri, Commented Dec 1, 2010 at 1:07
Open a file and print into it? I'm not sure that's what you want, but you may try: f=open('log.txt','w'); print>>f, stdout_value — Kabie
– Kabie, Commented Dec 1, 2010 at 1:17

nosklo · Accepted Answer · 2010-12-01 02:17:54Z

1

import subprocess
import glob

def egrep(pattern, *files):
    """ runs egrep on the files and returns the entire result as a string """
    cmd = ['egrep', pattern]
    for filespec in files:
        cmd.extend(glob.glob(filespec))
    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)
    return proc.communicate()[0]

results = egrep(r'^HTTP/', '*')
print 'results:'
print results

# write to file
with open('result_file.txt', 'w') as f:
    f.write(results)

answered Dec 1, 2010 at 2:17

nosklo

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Ignacio Vazquez-Abrams · Accepted Answer · 2010-12-01 02:25:10Z

0

One or any of the stdin, stdout, and stderr arguments to subprocess.Popen() can be file objects (or a file descriptor), which will cause the program to read from or write to the given files.

answered Dec 1, 2010 at 2:25

Ignacio Vazquez-Abrams

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