What is the difference between Brython and PyScript?

[dgront]

Dear all,

I've just came across PyScript:

https://pyscript.net/

Apparently it used pyodide under the hood. How does this technology compares to Brython? As far as I understand, it does not allow to go outside the

<py-script>

element that PyScript provides. In other words: what happens inside <py-script> must stay inside <py-script>; DOM manipulation is not possible. Am I right?

Best,

Dominik

[Edward Elliott]

Hi Dominik, interesting tool.  I think it came up in the mailing list last year.  Not a deep discussion, still very alpha stage.

The pyscript home page says this:

• Python with JavaScript: Bi-directional communication between Python and Javascript objects and namespaces

If I remember, pyscript doesn't have a DOM interface because pyodide is implemented in Web Assembly, which lacks direct DOM access.  But you can manipulate the DOM via interaction with Javascript code running outside WASM.  It's a pain but seems to be the only option.

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[Victor Norman]

No, pyscript can do DOM manipulation now.

[Goffi]

Hi Dominik,

I haven't tried myself, and PyScript is definitely interesting. But as far as I
know, either you use the full Python implementation and the blob to download
is huge, or you use the Micropython version which is really small, but then
you loose the full and recent versions Python compatibility.

Brython on the other hand target full Python compatibility, and the size of
the files to download can be reasonable.

In my personal use case (where I want to use some modules both in backend and
frontend), Brython seems the only choice. It's a good one in any case, I'm
really happy with it :)

Regards,
Goffi