In addition to executing code embedded in HTML, it's also possible to add a code editor directly into an HTML page using the py-repl tag so that you can input code and execute it, as shown below.

Beyond cProfile for Python profiling cProfile is hardly the only way to profile a Python application. cProfile is certainly one of the most convenient ways, given that it’s bundled with Python.

If you can find a way to speed up the implementation of that loop — say, by using Python built-ins instead of handwritten code — you could get a measurable performance improvement.