docs: def _get_file_md5(filename):
      """Compute the md5 checksum of a file"""
      md5_data = md5()
      with open(filename, 'rb') as f:
          for chunk in iter(lambda: f.read(128*md5_data.block_size), b''):
              md5_data.update(chunk)
      return md5_data.hexdigest()