If you're a regular user of Stack Overflow (or other Q&A sites) then you frequently find yourself posting snippets of code to answer people's questions. We've just soft-launched something that can help with that, so long as you're answering Python questions. If you put your code snippet in a GitHub Gist, then you can add a link to your SO answer that will run the code in a PythonAnywhere console. Here's an example by Hansel.
People who follow the link to your Gist console don't need a PythonAnywhere account -- it just runs in a throwaway sandbox. People who do have a PythonAnywhere account get the option to run it in their own sandbox or to log out then run it.
If you want to create your own Gist consoles you can do so here -- all you need is the URL of the gist to run.
As always, any comments/suggestions would be really welcome!