ui

Edit the Python. The app on the right is this page of code, and it re-runs as you type.

This code came in the link, and this site didn't write it. Read it, then

How to use it

Edit the code. The app re-runs a quarter second after you stop typing.
The page runs top to bottom on every interaction. A bare string is Markdown.
An input returns its value: n = ui.slider("n", 1, 9).
A button runs a function: ui.btn("add", do=add).
ui.state is a dict that survives re-runs.
print() output and tracebacks show under the code.
The address bar is a link to what you've written.
ui.search, ui.stream, ui.ai and ui.job need the real server and don't work here.