import subprocess

def find_dogweb_packages():
    # setuptools.find_packages is too slow since it walks the entire codebase, including Javascript code.
    # This is an equivalent but optimized function, specific to our codebase, listing all the available
    # packages.

    # Look for __init__.py files using fast UNIX tools
    r = subprocess.Popen(
        "find %s -name '__init__.py'" % " ".join(MODULE_PATHS), shell=True, stdout=subprocess.PIPE
    ).stdout.read()

from subprocess import Popen
Popen('/bin/ls %s' % ('something',), shell=True)

import subprocess
subprocess.Popen('/bin/ls %s' % ('something',), shell=True)

subprocess.Popen('/bin/ls %s' % ('something',), shell=False)