[issue24528] Misleading exeption for await in comprehensions.

2015-07-01 Thread Ivan Levkivskyi 

Ivan Levkivskyi added the comment:

Yury, thank you for the patch, the error message is much clearer now.

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[issue24528] Misleading exeption for await in comprehensions.

2015-06-30 Thread Roundup Robot 

Roundup Robot added the comment:

New changeset 30b676e8b21f by Yury Selivanov in branch '3.5':
Issue #24528: Improve error message for awaits in comprehensions
https://hg.python.org/cpython/rev/30b676e8b21f

New changeset 9598bc916186 by Yury Selivanov in branch 'default':
Merge 3.5 (Issue #24528)
https://hg.python.org/cpython/rev/9598bc916186

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nosy: +python-dev

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[issue24528] Misleading exeption for await in comprehensions.

2015-06-30 Thread Yury Selivanov 

Changes by Yury Selivanov yseliva...@gmail.com:


--
resolution:  - fixed
stage: patch review - resolved
status: open - closed

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[issue24528] Misleading exeption for await in comprehensions.

2015-06-29 Thread Yury Selivanov 

Changes by Yury Selivanov yseliva...@gmail.com:


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assignee:  - yselivanov

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[issue24528] Misleading exeption for await in comprehensions.

2015-06-29 Thread Ivan Levkivskyi 

New submission from Ivan Levkivskyi:

The following code:

async def foo():
lst = [await coro(i) for i in range(10)]
return lst

gives

SyntaxError: 'await' outside async function

I understand that this is because the comprehensions are implemented using a 
function scope (see also #10544), but such behavior is unintuitive.

IMO there are two possibilities here:
1) make comprehensions behave more like a for loop;
2) change the exception text to something like SyntaxError: 'await's in 
comprehensions are not supported.

I understand that the first option is probably not for 3.5 (it is beta 
already), but I will be happy if the second option will be implemented in 3.5

--
components: Interpreter Core, asyncio
messages: 245931
nosy: gvanrossum, haypo, levkivskyi, yselivanov
priority: normal
severity: normal
status: open
title: Misleading exeption for await in comprehensions.
type: behavior
versions: Python 3.5, Python 3.6

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[issue24528] Misleading exeption for await in comprehensions.

2015-06-29 Thread Yury Selivanov 

Yury Selivanov added the comment:

Thanks for discovering this, Ivan.  The patch is attached.

--
keywords: +needs review, patch
nosy: +ncoghlan
stage:  - patch review
Added file: http://bugs.python.org/file39834/awaitcomp.patch

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