Links to extension activities
1. https://silentteacher.toxicode.fr/hour_of_code.html?theme=basic_python
3. https://www.tynker.com/code/project/5baba0200460583e0438b028
4. https://docs.trinket.io/getting-started-with-python#/welcome/where-we-ll-go
5. https://hourofpython.trinket.io/python-challenges#/string-challenges/lowercase-challenge