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from typing import Literal
LETTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
def translate_message(
key: str, message: str, mode: Literal["encrypt", "decrypt"]
) -> str:
"""
>>> translate_message("QWERTYUIOPASDFGHJKLZXCVBNM","Hello World","encrypt")
'Pcssi Bidsm'
"""
chars_a = LETTERS if mode == "decrypt" else key
chars_b = key if mode == "decrypt" else LETTERS
translated = ""
# loop through each symbol in the message
for symbol in message:
if symbol.upper() in chars_a:
# encrypt/decrypt the symbol
sym_index = chars_a.find(symbol.upper())
if symbol.isupper():
translated += chars_b[sym_index].upper()
else:
translated += chars_b[sym_index].lower()
else:
# symbol is not in LETTERS, just add it
translated += symbol
return translated
def encrypt_message(key: str, message: str) -> str:
"""
>>> encrypt_message("QWERTYUIOPASDFGHJKLZXCVBNM", "Hello World")
'Pcssi Bidsm'
"""
return translate_message(key, message, "encrypt")
def decrypt_message(key: str, message: str) -> str:
"""
>>> decrypt_message("QWERTYUIOPASDFGHJKLZXCVBNM", "Hello World")
'Itssg Vgksr'
"""
return translate_message(key, message, "decrypt")
def main() -> None:
message = "Hello World"
key = "QWERTYUIOPASDFGHJKLZXCVBNM"
mode = "decrypt" # set to 'encrypt' or 'decrypt'
if mode == "encrypt":
translated = encrypt_message(key, message)
elif mode == "decrypt":
translated = decrypt_message(key, message)
print(f"Using the key {key}, the {mode}ed message is: {translated}")
if __name__ == "__main__":
import doctest
doctest.testmod()
main()
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