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Python standard library: subprocess

The standard library module subprocess can be used to start new process.

This module also allows to read/write into/from stdin, stdout and stderr.

subprocess intends to replace

Popen

from subprocess import Popen

proc = Popen(['gvim', __file__])
print('pid = {}'.format(proc.pid))

check_output runs a command and returns the command's output.

>>> print(subprocess.check_output('xclip -o', shell=True).decode('utf8'))