brute_force_caesar_cipher.py

import string


def decrypt(message: str) -> None:
    """
    >>> decrypt('TMDETUX PMDVU')
    Decryption using Key #0: TMDETUX PMDVU
    Decryption using Key #1: SLCDSTW OLCUT
    Decryption using Key #2: RKBCRSV NKBTS
    Decryption using Key #3: QJABQRU MJASR
    Decryption using Key #4: PIZAPQT LIZRQ
    Decryption using Key #5: OHYZOPS KHYQP
    Decryption using Key #6: NGXYNOR JGXPO
    Decryption using Key #7: MFWXMNQ IFWON
    Decryption using Key #8: LEVWLMP HEVNM
    Decryption using Key #9: KDUVKLO GDUML
    Decryption using Key #10: JCTUJKN FCTLK
    Decryption using Key #11: IBSTIJM EBSKJ
    Decryption using Key #12: HARSHIL DARJI
    Decryption using Key #13: GZQRGHK CZQIH
    Decryption using Key #14: FYPQFGJ BYPHG
    Decryption using Key #15: EXOPEFI AXOGF
    Decryption using Key #16: DWNODEH ZWNFE
    Decryption using Key #17: CVMNCDG YVMED
    Decryption using Key #18: BULMBCF XULDC
    Decryption using Key #19: ATKLABE WTKCB
    Decryption using Key #20: ZSJKZAD VSJBA
    Decryption using Key #21: YRIJYZC URIAZ
    Decryption using Key #22: XQHIXYB TQHZY
    Decryption using Key #23: WPGHWXA SPGYX
    Decryption using Key #24: VOFGVWZ ROFXW
    Decryption using Key #25: UNEFUVY QNEWV
    """
    for key in range(alphabet_len):
        translated = []
        for symbol in message:
            if symbol in alphabet:
                num = alphabet.find(symbol) - key
                translated.append(alphabet[num % alphabet_len])
            else:
                translated.append(symbol)
        print(f"Decryption using Key #{key}: {''.join(translated)}")


def main() -> None:
    message = input("Encrypted message: ").upper()
    decrypt(message)


if __name__ == "__main__":
    import doctest

    doctest.testmod()
    main()