Add simplejson

[bartbroere]

Add the simplejson package, so other packages can be more easily micropip installed if they happen to depend on this.

• Add a CHANGELOG entry
• Add / update tests
• Add new / update outdated documentation

[lesteve]

simplejson is pure Python right? So you should be able to install it with micropip.

so other packages can be more easily micropip installed if they happen to depend on this.

I don't quite understand what you mean by this, but maybe I am missing something. In principle await micropip.install('package-that-depends-on-simplejson') should work too, do you have an example of package where that does not work?

[bartbroere]

No, it has some (optional) C extensions for speedups, and doesn't ship a pure Python wheel, so it can't be installed with micropip.

If we include it in Pyodide, we enable installing some libraries which have simplejson as a dependency.

[lesteve]

OK I was not aware of this. For some reason await micropip.install('simplejson') is working fine in the stable console (the wheel it is using is https://files.pythonhosted.org/packages/56/40/c58cd470a57af4affa87da639a9d9d339a0d5898d98faa608ac43f3e191e/simplejson-3.19.1-py3-none-any.whl), but it is very likely not getting the optimised code written in C.

[bartbroere]

Ah okay, not sure what error I got that led me to believe there wasn't a pure Python wheel. Sorry about that.

It still might be worthwhile to include this package with the speedups in Pyodide though.

The test assures the speedups are also there, so we don't install the pure Python wheel with extra steps.

[bartbroere]

I found out what happened, the project that I micropip installed depended on an older version of simplejson, back when they didn't ship pure Python versions yet.

I'll make a PR to get that package up-to-date as well.

[hoodmane]

Well it doesn't hurt to include a faster compiled version.

[bartbroere]

Well it doesn't hurt to include a faster compiled version.

Alright! The test that imports simplejson._speedups should ensure that we don't end up with a pure Python version without realising it. (Which is possible because the setup.py seems to do pure Python as a fallback).

Let's hope it passes all CI checks this time.

[hoodmane]

Conveniently it doesn't depend on numpy so it isn't affected by #3816.

[hoodmane]

Thanks @bartbroere!