pip freeze: show only packages installed via pip

Question

I want to know which python packages are installed via pip and which are installed via rpm.

I run outside any virtualenv, and want to know if there are some packages installed via pip.

Background: Our policy is to use RPM at "root level". I want to find places where the policy was broken.

Answer 1

How about turn the question around slightly, and just check what belongs to rpms and what doesn't. Try:

import os, sys, subprocess, glob

def type_printed(pth, rpm_dirs=False):

    if not os.path.exists(pth):
        print(pth + ' -- does not exist')
        return True        
    FNULL = open(os.devnull, 'w')
    if rpm_dirs or not os.path.isdir(pth):
        rc = subprocess.call(['rpm', '-qf', pth], stdout=FNULL, stderr=subprocess.STDOUT) 
        if rc == 0:
            print(pth + ' -- IS RPM')
            return True 
        print(pth + ' -- NOT an RPM')
        return True 
    return False 


for pth in sys.path:
    if type_printed(pth):
        continue 
    contents = glob.glob(pth + '/*') 
    for subpth in contents:
        if type_printed(subpth, rpm_dirs=True):
            continue
        print(subpth + ' -- nothing could be determined for sure')

And pipe the output through something like

grep -e '-- NOT' -e '-- nothing could be determined'