rot13.py

# Dictionary to lookup the index of alphabets
dict1 = {'A' : 1, 'B' : 2, 'C' : 3, 'D' : 4, 'E' : 5,
        'F' : 6, 'G' : 7, 'H' : 8, 'I' : 9, 'J' : 10,
        'K' : 11, 'L' : 12, 'M' : 13, 'N' : 14, 'O' : 15,
        'P' : 16, 'Q' : 17, 'R' : 18, 'S' : 19, 'T' : 20,
        'U' : 21, 'V' : 22, 'W' : 23, 'X' : 24, 'Y' : 25, 'Z' : 26}
 
dict2 = {0 : 'Z', 1 : 'A', 2 : 'B', 3 : 'C', 4 : 'D', 5 : 'E',
        6 : 'F', 7 : 'G', 8 : 'H', 9 : 'I', 10 : 'J',
        11 : 'K', 12 : 'L', 13 : 'M', 14 : 'N', 15 : 'O',
        16 : 'P', 17 : 'Q', 18 : 'R', 19 : 'S', 20 : 'T',
        21 : 'U', 22 : 'V', 23 : 'W', 24 : 'X', 25 : 'Y'}
 
def encrypt(message, shift):
    cipher = ''
    for letter in message:
        if(letter != ' '):
            num = ( dict1[letter] + shift ) % 26
            cipher += dict2[num]
        else:
            cipher += ' '
 
    return cipher
    
# driver function to run the program
def main():
    message = "GEEKS FOR GEEKS"
    shift = 13
    result = encrypt(message.upper(), shift)
    print (result)

if __name__ == '__main__':
    main()







"""
👋 Hi, I’m @aarushinair - Aarushi Nair (she/her/ella)
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"""