readme.md

What Did I Learn?

In this challenge I learned about mapping:

1. Initializing mapping

mapping = {' ': ' '}

2. Create mapping

i = 0
letters = 'abcdefghijklmnopqrstuvwxyz'

for char in key:
    if char not in mapping:
        mapping[char] = letters[i]
        i += 1

3. Using mapping

res = ''
for char in message:
    res += mapping[char]