Can anyone tell me why turtle isn't working here?

Answer 1

Python playground not support turtle module and some more gui module. You can use web playground like :

https://www.sololearn.com/discuss/3045743/?ref=app
https://www.sololearn.com/discuss/3059831/?ref=app

Answer 2

https://code.sololearn.com/Wkzke3hvt8X5/?ref=app
https://code.sololearn.com/W6cmk391WqiN/?ref=app