code: def lines_stats(dir_path, file_filter):
      
      n_files = 0
      n_lines = 0
      for p in Path(dir_path).select_file(file_filter):
          n_files += 1
          n_lines += count_lines(p.abspath)
      return n_files, n_lines
docs: Lines count of selected files under a directory.
  
      :return n_files: number of files
      :return n_lines: number of lines