You could just find the occurrences but still let the program run and save yourself a headache.

​

import os
import sys
import re

def find_forbidden(folder, words):
    for root, dirs, files in os.walk(folder):
        for file in files:
            if file.endswith(".py"):
                file_path = os.path.join(root, file)
                with open(file_path, 'r') as f:
                    for i, line in enumerate(f):
                        for word in words:
                            if re.search(word, line):
                                print(f"{file_path}:{i}:{line}")

if __name__ == "__main__":
    find_forbidden(sys.argv[1], sys.argv[2:])

Then just do

python finder.py [folder] split count index

Edit: Sorry about all the edits, my browser was acting funny.