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

Antoine Pitrou solipsis at pitrou.net
Tue Apr 24 18:16:04 EDT 2018

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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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