I chose a simple task on CodeWars to explain and show my solution
Here is a task:
Welcome. In this kata you are required to, given a string, replace every letter with its position in the alphabet. If anything in the text isn't a letter, ignore it and don't return it. "a" = 1, "b" = 2, etc. Example alphabet_position("The sunset sets at twelve o' clock." Should return "20 8 5 19 21 14 19 5 20 19 5 20 19 1 20 20 23 5 12 22 5 15 3 12 15 3 11" (as a string)"
You can find my solution in a solution.py file