Add support for Python 3.13

[dstansby]

This adds support for Python 3.13, which was released a little while ago. I hope it's helpful - I'm happy to try and fix any issues found, or make any other changes needed.

The motivation here is to have wheels for Python 3.13 available.

[jmrouet]

I would like also to upvote for this PR as binary wheels for blosc are not available on python 3.13.

I have created issue #339 that this PR should close.

who can approve this PR ?

[FrancescAlted]

Thanks for the suggestion! Blosc 1.x series is not receiving any kind of funding for years, so it is in very low maintenance mode. We would like people to start using Blosc2, which is well more advanced and better funded. May I ask why you want to still use Blosc 1.x? In case you have compelling reasons for continuing using it, please consider funding the project; see Support Blosc for a Sustainable Future for details.

[jmrouet]

Thanks very much for the reply.

We have an internal python package that depends on blosc 1.x, and we never tried to upgrade to blosc 2.
If it's the way to go rather than adding support for python 3.13 to blosc 1.x, we will investigate how to upgrade.

Are there any tutorials on how to upgrade from 1.x to 2 ?

[FrancescAlted]

Great. We have tried hard to make Blosc2 API-compatible with Blosc1, so it should be easy. Mind that Blosc2 format is backward compatible with Blosc1, but the reverse is not true; this means that compressed data created with Blosc2 cannot be read with Blosc1-powered tools. Generally speaking, encouraging the transition to Blosc2 to your users is recommended.