PyScript lets you run Python scripts right in the browser, side by side with JavaScript, with two-way interaction between your code and the web page.

If a file containing this code was run directly on the Python runtime, the code associated with the if condition would execute. If the file was imported as a module, the code would not run. The if ...

But it has some other superpowers, too: it lets you run Python packages and programs without having to formally install them, all by way of one simple command.