API: Python (pure) (r1)

API	Uses canvas	Graphics libraries	AB framework	Worlds using this API	Starter Worlds
Python (pure) (r1)	No	PyScript	No	12 Worlds	Starter Worlds

This API supports Python in the browser. The World is pure Python (no JavaScript).

For Worlds with JavaScript and Python mixed together, see the Python APIs.

This API works as follows:

The World is a web page with HTML elements.
The code is pure Python. Python can write text and HTML to the page.
The API includes PyScript release 2025.8.1.
At run-time the Python code is interpreted by PyScript and run.
The Python code is syntax highlighted. It is not syntax checked. (JavaScript Worlds are syntax checked.)

Python 'print' and console.log are redefined:

PyScript redefines the Python 'print' function to output to console.log.
This API sets up a default div (the only element on the page) with id="ab-python-console"
The API then redefines console.log to output to that div.
So by default, both 'print' and console.log send their output to that div.
Caution that all console.log calls will go that div, including output you may not expect.
It is a run-time check, so to change this behaviour, Python code can remove the div. Then 'print' and console.log go back to sending output to the console.

For help on how to use Python in the Pyscript environment, see:

This API has further features:

Obfuscation is disabled. This API is new and a new (non JavaScript) obfuscation must be written.
Includes jQuery 3.6.0.
The API sets a blank page and sets a page title.
There is no run header.
You reload and close the page like any other tab.
Links on the page open in the same window (not in a new window like in the canvas APIs).
The API loads up minimal CSS that should not conflict with user CSS.
The style of the blank page is a body with margin 0 and padding 0. You can change it using JS like this:
```
 
  $('body').css( "margin", "20px" );
  $('body').css( "padding", "20px" );
```

Screenshots:

The screenshot does not assume there is a canvas. Instead it takes a screenshot of the HTML.
It uses the html2canvas library to build a screenshot of your page using JS.
The html2canvas library has some limitations and may not be able to accurately screenshot your page.

The underlying file type is .js:

The basic design of this site is for .js files. And there are issues with .py files on the server. So we simply leave the underlying file type as .js, which is safe. So even though there is no JS code and it is pure Python, underneath the file type is .js. It does not matter and you will not normally notice.

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