$3.$ Exercise $2$: Encode a Message

In the directory exercise$2$ there are two files: func.py and test.py$.$ The file test.py is a completed test script to help you with this exercise. The file func.py contains a stub for single function encode. This function encodes a string as a hidden message using a Caeser Cipher.

Read the specification and test cases carefully. More details about this function are provided in the detailed specifications in func.py$.$ Two helpful functions are ord and chr$.$ They are built into Python functions and are documented at the main Python website. ord converts a character into a number and chr converts it back.

Implement the function and test your answer with the test script. Make sure that your files remain in exercise$2$; do not move them outside this folder.