BIP 39 encode to mnemonic and decode for any string of length 16, 20, 24, 28, or 32 chars

bip39.py

#!/usr/bin/env python3
import argparse
from mnemonic import Mnemonic
import sys

def encode(mnemonic_str):
    m = Mnemonic("english")
    words = m.to_mnemonic(mnemonic_str.encode("utf-8"))
    return words

def decode(mnemonic_words):
    m = Mnemonic("english")
    try:
        mnemonic_str = m.to_entropy(mnemonic_words)
        return mnemonic_str.decode("utf-8")
    except:
        return None

def main():
    parser = argparse.ArgumentParser(description="BIP39 Encoding and Decoding Tool")
    parser.add_argument("action", choices=["e", "d"], help="Action to perform: e (encode) or d (decode) ")
    args = parser.parse_args()

    if args.action == "e":
        input_str = sys.stdin.readline().strip()
        result = encode(input_str)
        print(result)
    elif args.action == "d":
        input_str = sys.stdin.readline().strip()
        result = decode(input_str)
        if result:
            print(result)
        else:
            print("Decoding failed. Invalid mnemonic words.")
            
if __name__ == "__main__":
    main()