The CS50 Sandbox https://sandbox.cs50.io is a temporary programming environment for students and teachers.
You will need to Sign in to Github in order to access the CS50 Sandbox.
Once you've signed in, you'll have access to a Code Editor and a Terminal.
You can create a new File and then execute it via the Terminal.
You can also share a copy of your sandbox by clicking on the Share link on the top right hand corner.
If you're using Turtle Graphics or PyGame, select the X Window option.