🔥 Remove unused functionality from _typing.py file

[ivantodorovich]

It was only used to import the get_args and get_origin methods, but we can import them from typing_extensions directly.

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[svlandeg]

Hi, thanks for the contribution! It would be great to clean this up.

As you're deleting quite a bit of code though, can you elaborate a bit more on why it's all become obsolete?

[ivantodorovich]

Hi, thanks for the contribution! It would be great to clean this up.
As you're deleting quite a bit of code though, can you elaborate a bit more on why it's all become obsolete?

This file was extracted from pydantic, before pydantic removed it with its support of python3.6
The header said:
Copied from pydantic 1.9.2 (the latest version to support python 3.6.)

As mentioned above, the only 2 methods used in this big file were get_args and get_origin, which can easily be imported from the maintained typing_extensions package.

My guess is that this file was useful for python3.6, but now it's not, as libraries like typing_extensions or even the standard library have grown and include other alternatives

[svlandeg]

Currently, main.py uses the following functionality:

from ._typing import get_args, get_origin, is_literal_type, is_union, literal_values

Further, the _typing.py file has evolved from supporting 3.6-specific functionality to supporting other functions that may differ in Python versions 3.8 or 3.10 etc. As such, simply removing this feels too risky to me.

Instead, I would suggest to merge my PR #850 which only cleans up Python 3.6 related code, and go from there. I'll leave the final decision with Tiangolo though.

Either way - thanks again for the contribution! 🙏

[ivantodorovich]

Hello @svlandeg !

I understand your concerns.

At the time of my PR only two methods were imported and used from the _typing.py module: get_args and get_origin, and simply using their typing_extensions counterparts worked perfectly fine.

However, I see new developments have changed that situation since then, and so it would require more analysis, and the solution might not be just as simple anyway.

I do believe we should aim to drop this file and favor more battle tested alternatives like the typing_extensions module, which we are already using. Besides the maintenance burden, I believe it encourages contributors to keep using and improving the methods defined here instead of analyzing those of typing_extensions, making the situation harder to solve.

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[svlandeg]

@ivantodorovich: my counter proposal, reflected by the current state of this PR:

• Import get_args and get_origin from typing_extensions as you suggested

But, instead of entirely deleting the file:

• Remove most of the dead (Pydantic-specific) code from _typing.py
• Keep a few functions that may be relevant to Typer, such as is_union that is currently being used on master, and things like is_literal_type and literal_values that would be used by ✨ Add support for Literal type #669 or ✨ Support typing.Literal in Python 3.8+ #429

This will make the file much more manageable in the future, and it'll be easier to refactor functionality further when/if we need it.

[ivantodorovich]

Thanks @svlandeg !

That looks great ❤️

[tiangolo]

Great, thank you @ivantodorovich! ☕

And thanks @svlandeg for all the work and help here. 🙇 🍰