python typing: Optional is not optional! (intermediate) anthony explains

[@WaylonWalker]

I like when you keep the stream cam setup

[@shubhamjoshi6826]

thank you Anthony 😊

[@ng3147]

exactly the explanation i needed. thank you!

[@mmoussa01]

"from typing import Optional as Noneable" 😁

[@anthonywritescode]

too true!

[@Strider817]

I'm one of those people confused by this naming, and your video helped quite a bit in explaining stuff. However, I still don't understand why you can't set an optional function argument to Optional[int], since it seems like Optional means the type could be either Int or None. In your function y is an int when set by default, so why is it not valid to do this?

[@anthonywritescode]

you can use Optional[int] to annotate a function argument, however it has a different meaning than "this argument is optional" -- it actually means something closer to "this argument is None-able (nullable, but translated to pythonspeak)"

[@MatthewPherigo]

In NixOS types, this is called "NullOr", maybe more clear.

[@brianfontenot9925]

Optional is really a type that means we have a box and inside the box maybe there is some(value) or none(value). Its a great tool if enforced and completely eliminates the runtime nil/null reference at “compile” time. If incorporated into the language correctly

[@srkbhayo]

thank you . I was sos confused with this keyword

[@goodclover]

30:32 I'm sure there's plenty of other thing that you would want to change as well. 😅

[@retrom]

damn, which dimension is 30minutes into a 4minute video

[@goodclover]

@@retrom I have no idea what happened there.

[@sadhlife]

that new | syntax has already landed in 3.10 apparently

[@anthonywritescode]

indeed! I've got it in my copy of 3.10a2! >>> int | None int | None

[@sadhlife]

@@anthonywritescode noice

[@realabja1]

You awesome man🚀

[@shivanshmishra5293]

Trying to replicate maybe monad I guess.

[@anthonywritescode]

I mean, it's clear what it is -- just the name is bad :)

[@nexovec]

Even Option[int] would be way better I don't get it...

[@MElixirDNB]

OrNone might have been more intuitive. but now we can just use the easier | None syntax.. although lots of work environments are stuck on older python versions so pain ensues