Decorate \ delegate a File object to add functionality

Question

I\'ve been writing a small Python script that executes some shell commands using the subprocess module and a helper function:

import subprocess          


        

Answer 1

This simple solution worked for me:

import sys
import datetime
import tempfile
import subprocess as sp
def run(command, description):
    """Runs a command in a formatted manner. Returns its return code."""
    with tempfile.SpooledTemporaryFile(8*1024) as so:
        print >> sys.stderr, '%-65s' % description
        start=datetime.datetime.now()
        retcode = sp.call(command, shell=True, stderr=sp.STDOUT, stdout=so)
        end=datetime.datetime.now()
        so.seek(0)
        for line in so.readlines():
            print >> sys.stderr,'logging this:', line.rstrip()
        duration=end-start
        status='Done' if retcode == 0 else 'Failed'
        print >> sys.stderr, '%s (%d seconds)' % (status, duration.seconds)

REF_SCRIPT = r"""#!/usr/bin/python
import sys

sys.stdout.write('OUT\n')
sys.stdout.flush()
sys.stderr.write('ERR\n')
sys.stderr.flush()
"""

SCRIPT_NAME = 'refscript.py'

if __name__ == '__main__':
    with open(SCRIPT_NAME, 'w') as script:
        script.write(REF_SCRIPT)
    run('python ' + SCRIPT_NAME, 'Reference script')