If you are familiar with the Linux command line, you can also open up a terminal window from the Tools->Terminal menu.
Once this appears, you should enter the following
But also check out
the Python Hello World starter pack that serves as a template for Python projects in Codio and the .codio file has been configured so you can run the contained
or the Personal Playground assignment in the Python course where the .codio file has been configured so you can Run any 'current' file.
See https://docs.codio.com/project/ide/boxes/#customizable-run-menu for more on how you can configure the .codio file