Decodificare un messaggio

coded = 'D'
shift = 3
print(chr(ord(coded) - shift))

print(chr(ord('K') - 3))

coded = 'KLGH'
shift = 3
for letter in coded:
    print(chr(ord(letter) - shift))

coded = 'KLGH'
shift = 3
plain = ''
for letter in coded:
    plain += chr(ord(letter) - shift)
print(plain)

def decode(coded, shift):
    plain = ''
    for letter in coded:
        plain += chr(ord(letter) - shift)
    return plain
print(decode('KLGH', 3))

def encode(msg, s):
    out = ''
    for c in msg:
        out += chr(ord(c) + s)
    return out
def decode(msg, s):
    out = ''
    for c in msg:
        out += chr(ord(c) - s)
    return out
secret = encode('HELLO', 4)
print('Coded:', secret)
print('Back:', decode(secret, 4))

def decode(msg, s):
    out = ''
    for c in msg:
        out += chr(ord(c) - s)
    return out
print(decode('KLGH', 1))

def decode(msg, s):
    out = ''
    for c in msg:
        out += chr(ord(c) - s)
    return out
print(decode('JCRRA', 2))

def decode(msg, s):
    out = ''
    for c in msg:
        out += chr(ord(c) - s)
    return out
print('Message:', decode('OQQP', 2))

def decode(msg, s):
    out = ''
    for c in msg:
        out += chr(ord(c) - s)
    return out
print(decode('ZRZ', 3))