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alphabet = {

"A": ("ABCDEFGHIJKLM", "NOPQRSTUVWXYZ"),

"B": ("ABCDEFGHIJKLM", "NOPQRSTUVWXYZ"),

"C": ("ABCDEFGHIJKLM", "ZNOPQRSTUVWXY"),

"D": ("ABCDEFGHIJKLM", "ZNOPQRSTUVWXY"),

"E": ("ABCDEFGHIJKLM", "YZNOPQRSTUVWX"),

"F": ("ABCDEFGHIJKLM", "YZNOPQRSTUVWX"),

"G": ("ABCDEFGHIJKLM", "XYZNOPQRSTUVW"),

"H": ("ABCDEFGHIJKLM", "XYZNOPQRSTUVW"),

"I": ("ABCDEFGHIJKLM", "WXYZNOPQRSTUV"),

"J": ("ABCDEFGHIJKLM", "WXYZNOPQRSTUV"),

"K": ("ABCDEFGHIJKLM", "VWXYZNOPQRSTU"),

"L": ("ABCDEFGHIJKLM", "VWXYZNOPQRSTU"),

"M": ("ABCDEFGHIJKLM", "UVWXYZNOPQRST"),

"N": ("ABCDEFGHIJKLM", "UVWXYZNOPQRST"),

"O": ("ABCDEFGHIJKLM", "TUVWXYZNOPQRS"),

"P": ("ABCDEFGHIJKLM", "TUVWXYZNOPQRS"),

"Q": ("ABCDEFGHIJKLM", "STUVWXYZNOPQR"),

"R": ("ABCDEFGHIJKLM", "STUVWXYZNOPQR"),

"S": ("ABCDEFGHIJKLM", "RSTUVWXYZNOPQ"),

"T": ("ABCDEFGHIJKLM", "RSTUVWXYZNOPQ"),

"U": ("ABCDEFGHIJKLM", "QRSTUVWXYZNOP"),

"V": ("ABCDEFGHIJKLM", "QRSTUVWXYZNOP"),

"W": ("ABCDEFGHIJKLM", "PQRSTUVWXYZNO"),

"X": ("ABCDEFGHIJKLM", "PQRSTUVWXYZNO"),

"Y": ("ABCDEFGHIJKLM", "OPQRSTUVWXYZN"),

"Z": ("ABCDEFGHIJKLM", "OPQRSTUVWXYZN"),

}

def generate_table(key):

"""

>>> generate_table('marvin') # doctest: +NORMALIZE_WHITESPACE

[('ABCDEFGHIJKLM', 'UVWXYZNOPQRST'), ('ABCDEFGHIJKLM', 'NOPQRSTUVWXYZ'),

('ABCDEFGHIJKLM', 'STUVWXYZNOPQR'), ('ABCDEFGHIJKLM', 'QRSTUVWXYZNOP'),

('ABCDEFGHIJKLM', 'WXYZNOPQRSTUV'), ('ABCDEFGHIJKLM', 'UVWXYZNOPQRST')]

"""

return [alphabet[char] for char in key.upper()]

def encrypt(key, words):

"""

>>> encrypt('marvin', 'jessica')

'QRACRWU'

"""

cipher = ""

count = 0

table = generate_table(key)

for char in words.upper():

cipher += get_opponent(table[count], char)

count = (count + 1) % len(table)

return cipher

def decrypt(key, words):

"""

>>> decrypt('marvin', 'QRACRWU')

'JESSICA'

"""

return encrypt(key, words)

def get_position(table, char):

"""

>>> table = [

... ('ABCDEFGHIJKLM', 'UVWXYZNOPQRST'), ('ABCDEFGHIJKLM', 'NOPQRSTUVWXYZ'),

... ('ABCDEFGHIJKLM', 'STUVWXYZNOPQR'), ('ABCDEFGHIJKLM', 'QRSTUVWXYZNOP'),

... ('ABCDEFGHIJKLM', 'WXYZNOPQRSTUV'), ('ABCDEFGHIJKLM', 'UVWXYZNOPQRST')]

>>> get_position(table, 'A')

(None, None)

"""

if char in table[0]:

row = 0

else:

row = 1 if char in table[1] else -1

return (None, None) if row == -1 else (row, table[row].index(char))

def get_opponent(table, char):

"""

>>> table = [

... ('ABCDEFGHIJKLM', 'UVWXYZNOPQRST'), ('ABCDEFGHIJKLM', 'NOPQRSTUVWXYZ'),

... ('ABCDEFGHIJKLM', 'STUVWXYZNOPQR'), ('ABCDEFGHIJKLM', 'QRSTUVWXYZNOP'),

... ('ABCDEFGHIJKLM', 'WXYZNOPQRSTUV'), ('ABCDEFGHIJKLM', 'UVWXYZNOPQRST')]

>>> get_opponent(table, 'A')

'A'

"""

row, col = get_position(table, char.upper())

if row == 1:

return table[0][col]

else:

return table[1][col] if row == 0 else char

if __name__ == "__main__":

import doctest

doctest.testmod() # Fist ensure that all our tests are passing...

"""

ENTER KEY: marvin

ENTER TEXT TO ENCRYPT: jessica

ENCRYPTED: QRACRWU

DECRYPTED WITH KEY: JESSICA

"""

key = input("ENTER KEY: ").strip()

text = input("ENTER TEXT TO ENCRYPT: ").strip()

cipher_text = encrypt(key, text)

print(f"ENCRYPTED: {cipher_text}")

print(f"DECRYPTED WITH KEY: {decrypt(key, cipher_text)}")

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