caesars chiffre 1

caesarchiffre1.py

# Caesar Cipher
# from Al Sweigarts invent with python book https://inventwithpython.com/chapter14.html
 
MAX_KEY_SIZE = 26
 
def getMode():
     while True:
         print('Do you wish to encrypt or decrypt a message?')
         mode = input().lower()
         if mode in 'encrypt e decrypt d'.split():
             return mode
         else:
             print('Enter either "encrypt" or "e" or "decrypt" or "d".')

def getMessage():
     print('Enter your message:')
     return input()

def getKey():
     key = 0
     while True:
         print('Enter the key number (1-%s)' % (MAX_KEY_SIZE))
         key = int(input())
         if (key >= 1 and key <= MAX_KEY_SIZE):
             return key

def getTranslatedMessage(mode, message, key):
     if mode[0] == 'd':
         key = -key
     translated = ''

     for symbol in message:
         if symbol.isalpha():
             num = ord(symbol)
             num += key

             if symbol.isupper():
                 if num > ord('Z'):
                     num -= 26
                 elif num < ord('A'):
                     num += 26
             elif symbol.islower():
                 if num > ord('z'):
                     num -= 26
                 elif num < ord('a'):
                     num += 26

             translated += chr(num)
         else:
             translated += symbol
     return translated

mode = getMode()
message = getMessage()
key = getKey()

print('Your translated text is:')
print(getTranslatedMessage(mode, message, key))

caesarchiffre2.py

table = {"a":"x",
         "b":"y",
         "c":"z",
         "d":"0",
         "e":"#"}

def encrypt(raw):
    final = ""
    for char in raw:
        #if char in table:
        #    final+= table[char]
        #else:
        #    final += char
        final += table[char] if char in table else char
    print("decrypted text:",raw)
    print("encrypted text:",final)
    #return final
    
def decrypt(raw):
    final = ""
    for char in raw:
        #for (a,b) in table.items():
        #    if b == char:
        #        match = b
        #        break
        #else:
        #    match = char
        match = [a for (a,b) in table.items() if b == char]
        # match is a list!
        if len(match) == 1:
            final += match[0]
        else:
            final += char
    print("encrypted text:", raw )        
    print("decrypted text:", final)
    #return final

text = input("bitte text eingeben und [ENTER] drücken: >>>")
mode = input("""
bitte auswählen:
encrypt:............e + [ENTER]
decrypt:............d + [ENTER]
""")
if mode == "e":
    encrypt(text)
elif mode == "d":
    decrypt(text)
else:
    print("bitte nur e oder d drücken")