[python] Installing python module within code

for installing multiple packages, i am using a setup.py file with following code:

import sys
import subprocess
import pkg_resources

required = {'numpy','pandas','<etc>'} 
installed = {pkg.key for pkg in pkg_resources.working_set}
missing = required - installed


if missing:
    # implement pip as a subprocess:
    subprocess.check_call([sys.executable, '-m', 'pip', 'install',*missing])

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