What to expect in Python 3.13

With Python 3.12 let loose, and with a good chunk of that work laying the groundword for future Python versions, I think it's time to look at what we should get excited about in 3.13!

Below is a list of chapters cited against any relevant references which you'll find further down. It's absolutely worth doing further reading using these if you want to learn more!

Chapters:
0:00 - Intro
0:30 - Making the GIL optional [1-5]
1:05 - The new `interpreters` module [6-7]
1:52 - Subscriptable functions [8]
2:10 - warnings.deprecated decorator [9]
2:45 - Module level setattr and delattr dunder functions [10]
3:21 - Dead batteries [11-12]
4:12 - Outro

References:
[1] https://www.youtube.com/watch?v=zwqKtv5y8Bk
[2] https://www.youtube.com/watch?v=Wy4sI0zFXsU
[3] https://peps.python.org/pep-0703
[4] https://discuss.python.org/t/a-steering-council-notice-about-pep-703-making-the-global-interpreter-lock-optional-in-cpython/30474
[5] https://www.youtube.com/watch?v=rImAmkS2ySE
[6] https://peps.python.org/pep-0554
[7] https://aiochan.readthedocs.io/en/latest/csp.html
[8] https://peps.python.org/pep-0718
[9] https://peps.python.org/pep-0702
[10] https://peps.python.org/pep-0726
[11] https://peps.python.org/pep-0594
[12] https://docs.python.org/3.13/whatsnew/3.13.html

All PEPs scheduled for Python 3.13:
- https://peps.python.org/pep-0554
- https://peps.python.org/pep-0558
- https://peps.python.org/pep-0649
- https://peps.python.org/pep-0667
- https://peps.python.org/pep-0702
- https://peps.python.org/pep-0703
- https://peps.python.org/pep-0705
- https://peps.python.org/pep-0712
- https://peps.python.org/pep-0718
- https://peps.python.org/pep-0724
- https://peps.python.org/pep-0726
- https://peps.python.org/pep-0727
- https://peps.python.org/pep-0730

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