decrypt_shift_right.py

def decrypt_shift_right(decode_str):
    """Decode the given string (a step up the alphabest)
    a -> c
    b -> d
    ...
    k -> m
    o -> q
    e -> g
    ..
    z -> b
    """

    new_string = ''

    for decode_char in decode_str:
        if decode_char.isalpha():
            ascii_value = ord(decode_char)
            new_ascii = (ascii_value - 26 + 2) if (ascii_value >= 121) else (ascii_value + 2)
            #print(new_ascii)
            new_char = chr(new_ascii)
        else:
            new_char = decode_char

        new_string = new_string + new_char
    return new_string

print(decrypt_shift_right("fcjjm ucjamkc rm nwrfml..!!"))
print(decrypt_shift_right("g yk pykcqf..."))
print(decrypt_shift_right("wms'pc pcybgle gl kcbgsk"))
print(decrypt_shift_right("njcyqc qszqapgzc rm kw qrmpgcq"))