[Python 3.X] comment utiliser ce snippet

Hello,
j'ai trouvé ce snippet à prioro pour comparer deux dossiers de maniere recursive mais étant grand debutant en python je ne comprend pas comment l'utiliser.
Pourriez-vous m'expliquer ?

Merci

Code:

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#!/usr/bin/env python3
import argparse
from filecmp import dircmp
from os.path import getsize
 
changed_files = {}
deleted_files = {}
added_files = {}
 
def diff_file_size(file1, file2):
  return getsize(file2) - getsize(file1)
 
def diff_report():
  for k, v in deleted_files.items():
    print(k, v)
 
  for k, v in added_files.items():
    print(k, v)
 
  for k, v in changed_files.items():
    print(k, v)
 
def compare_dir(dir):
  for changed_file in dir.diff_files:
    file1 = "{0}/{1}".format(dir.left, changed_file)
    file2 = "{0}/{1}".format(dir.right, changed_file)
    changed_files[ file2 ] = diff_file_size(file1, file2)
 
  for deleted_file in dir.left_only:
    file1 = "{0}/{1}".format(dir.right, deleted_file)
    deleted_files[ file1 ] = "DELETED!"
 
  for added_file in dir.right_only:
    file1 = "{0}/{1}".format(dir.right, added_file)
    added_files[ file1 ] = "ADDED!"
 
  for sub_dir in dir.subdirs.values():
    compare_dir(sub_dir)
 
def main():
  parser = argparse.ArgumentParser(description="Usage for diff_dir.py")
  parser.add_argument('--dir1', type=str, required=True)
  parser.add_argument('--dir2', type=str, required=True)
  args = parser.parse_args()
 
  #dir = dircmp(args.dir1, args.dir2)
  dir = dircmp(args.dir1, args.dir2)
  compare_dir(dir)
  diff_report()
 
if __name__ == '__main__':
  main()