On Fri, Apr 16, 2021 at 6:03 AM Bluenix <bluenix...@gmail.com> wrote:
>
> Please accept PEP 649!
>
> Python's type hinting has become so much more useful than originally thought,
> and without this change much of that will be hindered. For example (you
> already know about Pydantic and FastAPI)
> [discord.py](https://github.com/Rapptz/discord.py)'s commands system allows
> you to use typehinting to specify how arguments should be converted. Take the
> following code:
>
> ```py
> import discord
> from discord.ext import commands
>
> bot = commands.Bot(command_prefix='>')
>
> @bot.command()
> # discord.py reads the typehints and converts the arguments accordingly
> async def reply(ctx, member: discord.Member, *, text: str): # ctx is always
> passed
> await ctx.send(f'{member.mention}! {text}')
>
> bot.run('token')
> ```
>
> I must say, this is extremely ergonomic design! Don't break it :)
Are you sure about PEP 563 break it and discord.py can not fix it?
As far as my understanding, PEP 563 don't hurt this use case so much:
* This use case evaluates runtime type information only once. So
eval() overhead is not a problem.
* Currently, annotation is very very complex and varies. For example,
List[int] will be `List[int]`, `List['int']`, `'List[int]'`,
`'List["int"]'`, `List[ForwardRef('int')]` etc...
After PEP 563, only `'List[int]'` is practical so we can stop
supporting `List["int"]` and others at some point.
So playing with runtime type will become easier in the future.
Am I wrong?
--
Inada Naoki <songofaca...@gmail.com>
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