[Python-Dev] assignment expressions: an alternative alternative proposal (original) (raw)

Guido van Rossum guido at python.org
Tue Apr 24 18:54:30 EDT 2018

We should really take this back to python-ideas at this point.

On Tue, Apr 24, 2018 at 3:16 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:

On Tue, 24 Apr 2018 09:38:33 -0400 Yury Selivanov <yselivanov.ml at gmail.com> wrote: > I propose to use the following syntax for assignment expressions: > > ( NAME = expr ) > > I know that it was proposed before and this idea was rejected, because > accidentally using '=' in place of '==' is a pain point in > C/C++/JavaScript.

To solve this issue, I would suggest another syntax: var NAME = expr Strong points: - the "var" keyword makes it clear that it's not a mistyped equality ("var NAME == expr" would be a syntax error) - the "var" keyword can stand out thanks to syntax highlighting - the "=" which traditionally spells assignement is there as well Weak points: - we need a deprecation cycle before "var" can be used as a keyword (alternative keyword choices against "var": "using", "let", "bind"...) Regards Antoine.

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