文件夹下字幕批量转utf8

from pathlib import Path
import shutil

for file in Path('./').iterdir():
    if not file.suffix=='.srt':
        continue
    txt=file.read_text(encoding='GB18030')
    fname=file.as_posix()
    shutil.copy(fname,fname+'.bak')
    file.write_text(txt,encoding='utf8')
    # print(txt)
    # break