How to redirect output with subprocess in Python?

Question

What I do in the command line:

cat file1 file2 file3 > myfile

What I want to do with python:

import subprocess, shlex
my         


        

Answer 1

UPDATE: os.system is discouraged, albeit still available in Python 3.

---

Use os.system:

os.system(my_cmd)

If you really want to use subprocess, here's the solution (mostly lifted from the documentation for subprocess):

p = subprocess.Popen(my_cmd, shell=True)
os.waitpid(p.pid, 0)

OTOH, you can avoid system calls entirely:

import shutil

with open('myfile', 'w') as outfile:
    for infile in ('file1', 'file2', 'file3'):
        shutil.copyfileobj(open(infile), outfile)