alphabet = "abcdefghijklmnopqrstuvwxyz"
def encrypt(txt):
shift = int(input("Enter the shift: "))
new_txt = ""
for x in txt:
if x in alphabet:
if alphabet.index(x)+shift >= len(alphabet):
new_txt += alphabet[(alphabet.index(x)+shift - len(alphabet))]
else:
new_txt += alphabet[alphabet.index(x)+shift]
else:
new_txt += x
return new_txt
def decrpyt(txt):
shift = int(input("Enter the known shift: "))
new_txt = ""
for x in txt:
if x in alphabet:
new_txt += alphabet[alphabet.index(x) - shift]
else:
new_txt += x
return new_txt
print(encrypt("yellow dog."))
print(decrpyt("lryybj qbt."))
My code works with lowercase text only. If you need me to modify the code, I can do that. I tested my code with a shift of 13 in both the encryption and decryption. I hope this helps!
