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

Chris Jerdonek chris.jerdonek at gmail.com
Tue Apr 17 04:26:46 EDT 2018

On Tue, Apr 17, 2018 at 12:46 AM, Chris Angelico <rosuav at gmail.com> wrote:

Having survived four rounds in the boxing ring at python-ideas, PEP 572 is now ready to enter the arena of python-dev. I'll let the proposal speak for itself. Be aware that the reference implementation currently has a few test failures, which I'm still working on, but to my knowledge nothing will prevent the proposal itself from being successfully implemented.

Very interesting / exciting, thanks!

Augmented assignment is not supported in expression form::

>>> x +:= 1 File "", line 1 x +:= 1 ^ SyntaxError: invalid syntax

Can you include in the PEP a brief rationale for not accepting this form? In particular, is the intent never to support it, or is the intent to expressly allow adding it at a later date (e.g. after getting experience with the simpler form, etc)?

--Chris

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