This is an example how to count words in a text file using Python 3

koalition.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-


'''
Author: @niftycode
Version: 1.3
Python 3.10
Date created: February 14th, 2018
Date modified: December 1st, 2021
'''

import re
import argparse
import logging

logging.basicConfig(level=logging.disable())
# logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger()

VERSION = "1.0"
FILE_NAME = "koalitionsvertrag_2021.txt"  # <- Enter your file here.


def get_parser() -> argparse.ArgumentParser:
    """
    Create a command line parser.
    Returns:
        argparse.ArgumentParser: Created parser
    """
    parser = argparse.ArgumentParser()

    parser.add_argument(
        "-w", "--word", type=str, required=False, help="the word to search for"
    )

    parser.add_argument(
        "-v", "--version", required=False, action="store_true", help="show the version"
    )

    return parser


def find_word(search_tearm: str):
    """
    Open a textfile and search for the given word.
    Show the number of words found.
    Show the total.
    Args:
        search_tearm:
            The word to search for
    """

    # It is good practice to use the with keyword when dealing with file objects.
    with open(FILE_NAME) as file_handle:

        for line in file_handle:
            line = line.rstrip()
            text_line = re.findall(
                search_tearm + "[^ ]*", line  # <- define your regex here
            )
            logger.debug(text_line)

            for w in text_line:
                found_words[w] = found_words.get(w, 0) + 1
                logger.debug(found_words)

    print("")
    word_count = 0
    total = 0
    for word, count in found_words.items():
        print(f"Searched word: {word}\n Count: {count}")
        word_count += 1
        total += count
    print("")
    print("Total number: {0}".format(total))


def main():
    """
    Invoke the parser and evaluate the result.
    """
    parser = get_parser()
    args = parser.parse_args()

    if args.word:
        find_word(args.word)
    elif args.version:
        print(f"Koalitionsvertrag - Version: {VERSION}")
    else:
        parser.print_help()


if __name__ == "__main__":
    # Create an empty dict for the words found
    found_words = dict()
    main()