Message 377435 - Python tracker

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Author	slebedev
Recipients	lys.nikolaou, slebedev
Date	2020-09-23.23:33:02
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1600903982.27.0.474581886877.issue41848@roundup.psfhosted.org>
In-reply-to

Content
Reproducer: [x for x in [] if lambda: x] This parses fine in 3.8, but doesn't parse in 3.9 because the grammar expects a disjunction after if in for_if_clause []. While this change has zero practical significance, I think it might be useful to maintain a list of such changes for tooling authors (who might need to support multiple Python versions). []: https://github.com/python/cpython/blob/68526fe258da8c01196fd7cf48e8e5f1280bf8fd/Grammar/python.gram#L523

Reproducer:

[x for x in [] if lambda: x]

This parses fine in 3.8, but doesn't parse in 3.9 because the grammar expects a disjunction after if in for_if_clause [*]. While this change has zero practical significance, I think it might be useful to maintain a list of such changes for tooling authors (who might need to support multiple Python versions).

[*]: https://github.com/python/cpython/blob/68526fe258da8c01196fd7cf48e8e5f1280bf8fd/Grammar/python.gram#L523

History
Date	User	Action	Args
2020-09-23 23:33:02	slebedev	set	recipients: + slebedev, lys.nikolaou
2020-09-23 23:33:02	slebedev	set	messageid: <1600903982.27.0.474581886877.issue41848@roundup.psfhosted.org>
2020-09-23 23:33:02	slebedev	link	issue41848 messages
2020-09-23 23:33:02	slebedev	create