[Python-Dev] Accepting PEP 572, Assignment Expressions (original) (raw)

Chris Jerdonek chris.jerdonek at gmail.com
Thu Jul 12 06:06:32 EDT 2018

(status := "Accepted") and "Congratulations!" ;-) (hope I did that right, but I can't try it yet!)

Thanks for hanging in there, Guido, and for your patience with everyone during the discussions. I'm glad you're still with us!

--Chris

On Wed, Jul 11, 2018 at 5:10 PM, Guido van Rossum <guido at python.org> wrote:

As anticippated, after a final round of feedback I am hereby accepting PEP 572, Assignment Expressions: https://www.python.org/dev/peps/pep-0572/

Thanks to everyone who participated in the discussion or sent a PR. Below is a list of changes since the last post ( https://mail.python.org/pipermail/python-dev/2018-July/154557.html) -- they are mostly cosmetic so I won't post the doc again, but if you want to go over them in detail, here's the history of the file on GitHub: https://github.com/python/peps/commits/master/pep-0572.rst, and here's a diff since the last posting: https://github.com/python/peps /compare/26e6f61f...master (sadly it's repo-wide -- you can click on Files changed and then navigate to pep-0572.rst). - Tweaked the example at line 95-100 to use result = ... rather than return ... so as to make a different rewrite less feasible - Replaced the weak "2-arg iter" example with Giampaolo Roloda's while chunk := file.read(8192): process(chunk) - *Added prohibition of unparenthesized assignment expressions in annotations and lambdas* - Clarified that TargetScopeError is a new subclass of SyntaxError - Clarified the text forbidding assignment to comprehension loop control variables - Clarified that the prohibition on := with annotation applies to inline annotation (i.e. they cannot be syntactically combined in the same expression) - Added conditional expressions to the things := binds less tightly than - Dropped section "This could be used to create ugly code" - Clarified the example in Appendix C Now on to the implementation work! (Maybe I'll sprint on this at the core-dev sprint in September.) -- --Guido van Rossum (python.org/~guido)

Python-Dev mailing list Python-Dev at python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/ chris.jerdonek%40gmail.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20180712/9a17e7c0/attachment.html>

More information about the Python-Dev mailing list