How to make a cipher in python?

Question

I've been trying, but im stuck on how to output their input in decoded fashion.
Same issue with encoding a decoded input.
Any ideas?

Answer 1

Every character has an ordinal number (unicode position). You can get that with ord(). And you can turn a number into the corresponding letter with chr().
So one way would be manipulating this number.
chr(97) leads to 'a', chr(98) to 'b'. So for example to switch a letter of a string against the next one in the alphabet, you can loop over the string, translate the letter to its number, increase that number, turn it back to a string, add it.
for letter in str1:
str2 += chr(ord(letter)+1)
You could also put your letters in a list and work with the indexes.
https://code.sololearn.com/cKQmoIQ3Ioqn/?ref=app

Answer 2

inp is just the variable that takes the user input in the format I describe in the initial comment.
The input gets split directly into steps, direction and the actual sentence to be encoded.
So it's a list with three elements.

Answer 3

What sort of encoding are you going for?

Answer 4

a to b AND a to b?
Apple to Bapple added a letter, not exchanged one.
I still don't see what exactly you want to do.
You first need to choose an encoding pattern, don't you?

Answer 5

Ah, sorry. Its a type and I meant apple to bpple.
I just want to know how to output their input and replacing letters to the one that corresponds with the code.

Answer 6

Ok, thanks. In your code, what does inp do exactly?

Answer 7

For example, if I wanted to change a to b and a to b, etc., how would I go about changing the string, for example, "Apple" using the code to make it output "Bapple"?