The best alternatives to PythonSandbox are Lightstep, Interview Sandbox, and Sandbox. If these 3 options don't work for you, we've listed a few more alternatives below.
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LightStep diagnoses anomalies and slowdowns, spanning mobile, monoliths, and microservices: best-in-class observability, at scale, for modern applications.
Interview Sandbox is an app that came out of the desire for a place to practice, pencil, and perform without having to have a split screen, or to spend time drawing on a piece of paper and showing your interviewer your thoughts.
PlayCode is a website where you can type in code and it immediatly shows you what you programmed in a little extra tab. All you need to do is select a programming language or a framework and you can start without needing to set up anything.