ALL of Python 3.13's MAJOR typing changes

[@renren_does_programming]

Nice, one step closer to pi-thon

[@PennyEvolus]

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[@maleldil1]

Why do you use the old generics syntax for these examples? IMO, it doesn't much sense to use the old syntax when the new one is available. I understand using it for more general videos, so they apply to a wider public, but not here. Regardless, I'd appreciate it if you could show both versions anyway. Anyway, great video. Hopefully pyright implements the new typing stuff soon.

[@Carberra]

Largely because the PEP uses the old syntax, and neither Mypy or Pyright was particularly happy using the new syntax with defaults, so I decided to go with what's definitely known to work rather than complicate it. Glad you enjoyed the video though!

[@Heavy_Lvy]

@@Carberra i hate the old syntax😭😭

[@Heavy_Lvy]

7:16 probably the extension is using a older version of pyright or mypy. The extension won't use the pyright/mypy version installed on your environment.

[@Carberra]

I was using the latest version of Pyright (at time of recording) from the terminal, not an extension. If Pyright doesn't support something, it's pretty much a dead cert Mypy doesn't support it either.

[@Heavy_Lvy]

@@Carberra hmm thats strange then, it was working fine for me just not default TypeVars with 3.13 syntax.🤷‍♂🤷‍♂🤷‍♂🤷‍♂

[@EngineerNick]

Thankyou this was a great summary and demo :)

[@fmitchell238a]

Thanks for this. I'm just now catching up on 3.13's features. A video on support for Protocols would be appreciated. My statically typed brain still can't quite fit itself around Python's protocols using duck typing, and compile-time or run-time predicates verifying that a class conforms to a Protocol would make using Protocols feel like black magic (or pure superstition).

[@Carberra]

Glad you enjoyed it! Protocols is actually a topic I've been meaning to cover for a while, so I'll bump that up the queue! The runtime checkable thing is a pretty nice feature, so I'll make sure to cover that as well.

[@marckiezeender]

Protocols are basically just interfaces but without explicitly implementing them.

[@jimhrelb2135]

I use Protocols to enforce kwargs types, so not just using Callable to enforce vargs

[@murphygreen8484]

What's the benefits of ReadOnly over Final?

[@Carberra]

Can you use Final in TypedDicts? If so, I'm honestly not sure!

[@murphygreen8484]

@@Carberra oh I'm not sure, it's part of the typing library though! Speaking of typing things - why is typing a openpyxl object such a nightmare? I can't get PyCharm to recognize it

[@Carberra]

I believe Openpyxl isn't typed. If it has a stubs package, might be a case of installing that and getting PyCharm to recognise it? Though this isn't the first time I've heard about someone having trouble _this week_, so idk if something's going on.

[@chrism6880]

Is it possible to back port the new repl to use it with older python versions?

[@Carberra]

Not to my knowledge. You can use the third-party IPython REPL in older versions though, which is different but very nice to use.

[@solojazz75]

wait I thought that python 3.13 was about using 'type' as a keyword instead of TypeVar

[@Carberra]

3.12 introduced the type keyword as an alternative to TypeAlias. It also introduced an alternative syntax for TypeVars (though I haven't used that here as it's not fully supported by type checkers).

[@solojazz75]

@@Carberra yeah i was with the idea it's the preferred way over TypeVar now. type T = ContextType

[@solojazz75]

it seems a bit more pythonic that TypeVar