count_code_lines.py

import os
import re


def count_code_lines(fpath):
    count = 0
    if os.path.isdir(fpath):
        file_list = os.listdir(fpath)
        for fname in file_list:
            child_path = os.path.join(fpath, fname)
            count += count_code_lines(child_path)
    else:
        ext = os.path.splitext(fpath)[1]
        if ext == '.java':
            count += len(open(fpath, mode='r', encoding='utf-8').readlines())
    return count


if __name__ == "__main__":
    fpath = r'E:\Programs\jd-gui-windows-1.6.4\heroes-lore-wind-of-solti.jar.src'

    print(repr(fpath))
    print(count_code_lines(fpath))