convert_encodings.py

import glob
import chardet  # pip install chardet


def decode(d, preferred_encodings):
    for e in preferred_encodings:
        try:
            return d.decode(e)
        except UnicodeDecodeError:
            pass
    # chardet is not so smart
    return d.decode(chardet.detect(d).get("encoding"))


def main():
    for file in glob.glob("*.txt"):
        with open(file, "rb") as f:
            d = decode(f.read(), preferred_encodings=['cp949'])
        with open(file, "wb") as f:
            f.write(d.encode("utf-8"))


if __name__ == "__main__":
    main()