GBK to UTF-8 in Python 3

gbk2utf8.py

#!/usr/bin/env python3

from typing import Optional
import os
import fire


def gbk2utf8(path: str, out: Optional[str]='utf8_out.txt') -> None:
    """Convert file encoded in GBK into UTF-8

    :param path: path to the file encoded in GBK
    :param out: optional output UTF-8 file path (default is utf8_out.txt)
    """
    with open(os.path.expanduser(path), 'rb') as gbk_file:
        with open(os.path.expanduser(out), 'w') as utf8_file:
            utf8_file.write(gbk_file.read().decode('gbk'))


if __name__ == '__main__':
    fire.Fire(gbk2utf8)