What is the difference between Transcrupt and Pyodide?

[ghost]

I'm looking for options to execute my python code in javascript and would like to know what I can do in order to best integrate the two languages. I was wondering if Transcrypt of Pyodide would be a better option, and would really appreciate any advice on what the nuances of either one are. Thanks!

[JennaSys]

The main difference between the two, is that Pyodide runs Python right in the browser via WebAssembly whereas Transcrypt transpiles Python into JavaScript preemptively as a separate step before it ever gets sent to the browser. The advantage of Transcrypt is that what is sent to the browser will be smaller and/or likely have better performance than running or compiling Python directly in the browser.

This post by Anvil is getting a little dated as there are some new options available now (like PyScript), but it does a good job of explaining some of the differences in how they work. They all have valid use cases, it just depends on what your needs and priorities are.

[ghost]

Thank you! I'm much more interested in the concept of transcrypt as I think it stays truer to the webassembly paradigm. What version of python can we transcrypt into usable .js files?

[JennaSys]

Transcrypt has a hard dependency on Python 3.9 right now because it uses and is coded based the Python AST module. Using a different Python version where the AST might be different, can cause issues with how the JavaScript is generated.