Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #102308 > unrolled thread

Re: Cannot step through asynchronous iterator manually

Back to article view | Back to comp.lang.python

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: Cannot step through asynchronous iterator manually Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2016-01-30 18:22 +0000

#102308 — Re: Cannot step through asynchronous iterator manually

On 30 January 2016 at 16:42, Ian Kelly <ian.g.kelly@gmail.com> wrote:
>> AFAICT there's no generator-function-style syntax for writing an async
>> iterator so you'd have to make a class with the appropriate methods if
>> you wanted to be able to loop over aslice with async for.
>
> Before you go any further with this, be sure to check out the aitertools
> third-party module. I haven't done anything with it myself, but it already
> claims to provide aiter and anext as well as async versions of everything
> in the standard itertools module.

Right you are. There is aslice and it is implemented as a class with
__anext__ etc. methods:
https://github.com/asyncdef/aitertools/blob/master/aitertools/__init__.py#L747

My original suggestion just becomes:

from aitertools import alist, islice

rows = await alist(islice(cur, 2))  # pull at most 2 rows

--
Oscar

[toc] | [standalone]

Back to top | Article view | comp.lang.python

csiph-web