Erg pystd fixes

[lion24]

Relates to #213

The following PR fixes a typo in abc.d.er and add missing subclasshook api.

Changes proposed in this PR:

• feat(erg): add subclasshook method in abc.d.er
• fix(erg_compiler): fix typo in abc.d.er otherwise linting an interface that use subclasshook method will fail

@mtshiba

[mtshiba]

Thank you!

[lion24]

Hi @mtshiba

Thanks for the approval 😊

That's a pitty that those files needs to be manually written.
Maybe you already start to explore this, but I'm currently doing researchs to check if it's not possible to use the Python AST to transpiled modules file directly into erg code.
I already have something that work for a basic class containing some methods. I still didn't look on the reflection way for the module discovery.

But that would be great to not have to wrote those file manually and let the transpiler automatically generate them 😄

BTW this is a great project.

Cheers,
Lionel.

[mtshiba]

Hi, thanks for your contribution to the Erg project and your constructive comments!

Actually, I'm trying out the idea too, but automatic generation of type definition files with pylyzer is still experimental. The advantage of being able to inspect modules that are not typed manually is great, but the quality difference is still big.
Not only that, Erg has its own advanced type system, which has a lot to offer that type inference can't provide, so there's no way around it other than generating it manually.

The current best practice is to generate type definition files using pylyzer and then manually edit them.