[Python-ideas] Top Level Await in Python like in Deno

[redr...@gmail.com]

Hi all,

Deno is JavaScript runtime that has very nice feature like Top Level Await, I think it would be also nice to have such feature in Python, it will make using async/await more convenient

What do you think ? Share your ideas lets discuss ...
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[Steven D'Aprano]

On Sat, Feb 06, 2021 at 10:26:23AM -0000, redr...@gmail.com wrote:

> Deno is JavaScript runtime that has very nice feature like Top Level
> Await, I think it would be also nice to have such feature in Python,
> it will make using async/await more convenient
>
> What do you think ? Share your ideas lets discuss ...

I don't know what to think because I don't know what "top level await"
means to you. Can you show an example of what it would look like, how
you would use it, and *why* you would use it?

Can you show a simple example of a task that would be better with top
level await, and why it is better?


--
Steve

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[redr...@gmail.com]

I mean to be able to do something like this:
```python
import asyncio

await asyncio.sleep(1);
```

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[Guido van Rossum]

The proposal is to add a default event loop that is always active.

On Sat, Feb 6, 2021 at 06:41 <redr...@gmail.com> wrote:

I mean to be able to do something like this:
```python
import asyncio

await asyncio.sleep(1);
```

--

--Guido (mobile)

[Matthias Bussonnier]

If it's for the REPL, it's already there, you simply need to start the
async REPL.

$ python -m asyncio
asyncio REPL 3.8.5 | packaged by conda-forge | (default, Sep 16 2020, 17:43:11)
[Clang 10.0.1 ] on darwin
Use "await" directly instead of "asyncio.run()".
Type "help", "copyright", "credits" or "license" for more information.
>>> import asyncio
>>> await asyncio.sleep(1)
>>>

compile and exec have a mode to allow top-level async as well if you
want it programmatically, then you can `await` your code object.
--
Ma

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[redr...@gmail.com]

It is not the same, it will work in interactive mode .... But I want to run application without interactive mode

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[Joao S. O. Bueno]

[Joao S. O. Bueno]

Sorry - previous reply was sent empty.

So, you probably can do with `asyncio.run`:
```
In [26]: import asyncio

In [27]: asyncio.run(asyncio.sleep(2))
```
https://docs.python.org/3/library/asyncio-task.html#asyncio.run

On Wed, 24 Mar 2021 at 06:44, <redr...@gmail.com> wrote:

[redr...@gmail.com]

Yes I can, but I am taking about to use it without `asyncio.run`

Whenever Python in Top-Level faces with await it will wrap calling all top level statement in async function (for example)

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[AlexDeLorenzo.dev]

I like this idea. It's already the default behavior of the IPython shell, and it would allow for easy scripting with async libraries. I think importing the asyncio module at the top level should do what Guido said, by adding a default event loop that's always active.