[issue39545] await is not supported in f-string in 3.6
New submission from Serhiy Storchaka storchaka+cpython@gmail.com:
The following code is compiled in 3.7, but is a syntax error in 3.6.
async def f(x): f"{await x}"
I have not found mentioning this change in What's New, and it looks grammatically correct. It looks as a bug in 3.6.
It may be too later to fix it in 3.6, but at least it should be documented.
---------- assignee: docs@python components: Documentation, Interpreter Core messages: 361317 nosy: docs@python, eric.smith, serhiy.storchaka priority: normal severity: normal status: open title: await is not supported in f-string in 3.6 type: behavior versions: Python 3.6
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Mariatta mariatta@python.org added the comment:
The answer I got from Yury before was: "Before 3.7 async and await were not proper keywords, so the interpreter did not recognize them in some contexts."
---------- nosy: +Mariatta
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Serhiy Storchaka storchaka+cpython@gmail.com added the comment:
Yes, await was recognized only in asynchronous functions. f-strings involve a separate parsing step for subexpressions, and it is not aware that it is in an asynchronous function. Seems the fix was unintentional, but it should documented in any case.
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Change by Karthikeyan Singaravelan tir.karthi@gmail.com:
---------- nosy: +yselivanov
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Rohit Sanjay sanjay.rohit2@gmail.com added the comment:
Hey, I'd like to work on this issue. Seems like an easy fix. Can you please help me out with where I will need to add the documentation for this?
---------- nosy: +rohitsanjay
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Elena Oat oat.elena@gmail.com added the comment:
There was no update on this since 02/04, so I will work on this as I am at the PyCascades sprints right now.
---------- nosy: +Elena.Oat
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Change by Elena Oat oat.elena@gmail.com:
---------- keywords: +patch pull_requests: +17807 stage: -> patch review pull_request: https://github.com/python/cpython/pull/18433
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Change by Elena Oat oat.elena@gmail.com:
---------- pull_requests: +17808 pull_request: https://github.com/python/cpython/pull/18434
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Ned Deily nad@python.org added the comment:
New changeset a2963f09629a0a8c63e9acef79c1dcc0a040ddb6 by Elena Oat in branch '3.6': bpo-39545: docs: do not use await in f-strings (GH-18434) https://github.com/python/cpython/commit/a2963f09629a0a8c63e9acef79c1dcc0a04...
---------- nosy: +ned.deily
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Ned Deily nad@python.org added the comment:
Thanks for the PR! We don't normally accept doc changes for branches in security-fix mode but this seems like a worthwhile exception.
---------- resolution: -> fixed stage: patch review -> resolved status: open -> closed
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Serhiy Storchaka storchaka+cpython@gmail.com added the comment:
Needed also notes in 3.7+.
---------- resolution: fixed -> stage: resolved -> status: closed -> open versions: +Python 3.7, Python 3.8, Python 3.9 -Python 3.6
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Change by Serhiy Storchaka storchaka+cpython@gmail.com:
---------- pull_requests: +17830 stage: -> patch review pull_request: https://github.com/python/cpython/pull/18456
_______________________________________ Python tracker report@bugs.python.org https://bugs.python.org/issue39545 _______________________________________
Change by Serhiy Storchaka storchaka+cpython@gmail.com:
---------- pull_requests: +17833 pull_request: https://github.com/python/cpython/pull/18459
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Ned Deily nad@python.org added the comment:
New changeset cebe9ee988837b292f2c571e194ed11e7cd4abbb by Serhiy Storchaka in branch '3.6': bpo-39545: Document restrictions on "await" and "async for" in f-strings. (GH-18459) https://github.com/python/cpython/commit/cebe9ee988837b292f2c571e194ed11e7cd...
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miss-islington mariatta.wijaya+miss-islington@gmail.com added the comment:
New changeset f632736023502816f2e6bd714d1b48c81aa2ccc1 by Serhiy Storchaka in branch 'master': bpo-39545: Document changes in the support of await in f-strings. (GH-18456) https://github.com/python/cpython/commit/f632736023502816f2e6bd714d1b48c81aa...
---------- nosy: +miss-islington
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Change by miss-islington mariatta.wijaya+miss-islington@gmail.com:
---------- pull_requests: +17881 pull_request: https://github.com/python/cpython/pull/18505
_______________________________________ Python tracker report@bugs.python.org https://bugs.python.org/issue39545 _______________________________________
Change by miss-islington mariatta.wijaya+miss-islington@gmail.com:
---------- pull_requests: +17882 pull_request: https://github.com/python/cpython/pull/18506
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miss-islington mariatta.wijaya+miss-islington@gmail.com added the comment:
New changeset 46cf4fc8a5646ca35f7d1ac06d2ef33eb9efca1d by Miss Islington (bot) in branch '3.7': bpo-39545: Document changes in the support of await in f-strings. (GH-18456) https://github.com/python/cpython/commit/46cf4fc8a5646ca35f7d1ac06d2ef33eb9e...
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miss-islington mariatta.wijaya+miss-islington@gmail.com added the comment:
New changeset 581b8606ca0609cf36c4eb9a5bb025eb77540e5e by Miss Islington (bot) in branch '3.8': bpo-39545: Document changes in the support of await in f-strings. (GH-18456) https://github.com/python/cpython/commit/581b8606ca0609cf36c4eb9a5bb025eb775...
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Change by Serhiy Storchaka storchaka+cpython@gmail.com:
---------- resolution: -> fixed stage: patch review -> resolved status: open -> closed versions: +Python 3.6
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participants (7)
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Elena Oat -
Karthikeyan Singaravelan
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Mariatta
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miss-islington
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Ned Deily
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Rohit Sanjay
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Serhiy Storchaka