Message 329511 - Python tracker

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Author	serhiy.storchaka
Recipients	docs@python, gvanrossum, martin.panter, mdk, serhiy.storchaka
Date	2018-11-09.12:27:25
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1541766445.71.0.788709270274.issue33878@psf.upfronthosting.co.za>
In-reply-to

Content
I think that the fact that `(a) = 42` is accepted is rather an implementation detail, and the consequence of limitations of the grammar parser. It accepts arbitrary expression at the left hand side of assignment. After transforming CST to AST unsuitable targets are rejected, but information about grouping parenthesis is lost at this stage. This can be fixed if check the left hand side node before converting to AST.

I think that the fact that `(a) = 42` is accepted is rather an implementation detail, and the consequence of limitations of the grammar parser. It accepts arbitrary expression at the left hand side of assignment. After transforming CST to AST unsuitable targets are rejected, but information about grouping parenthesis is lost at this stage.

This can be fixed if check the left hand side node before converting to AST.

History
Date	User	Action	Args
2018-11-09 12:27:25	serhiy.storchaka	set	recipients: + serhiy.storchaka, gvanrossum, docs@python, martin.panter, mdk
2018-11-09 12:27:25	serhiy.storchaka	set	messageid: <1541766445.71.0.788709270274.issue33878@psf.upfronthosting.co.za>
2018-11-09 12:27:25	serhiy.storchaka	link	issue33878 messages
2018-11-09 12:27:25	serhiy.storchaka	create