[Python-Dev] Is PEP 572 really the most effective way to solve the problems it's targeting? (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Thu Apr 26 07:42:33 EDT 2018

On Thu, 26 Apr 2018 20:35:20 +0900 "Stephen J. Turnbull" <turnbull.stephen.fw at u.tsukuba.ac.jp> wrote:

Steven D'Aprano writes: > On Wed, Apr 25, 2018 at 09:36:31PM -0500, Ryan Gonzalez wrote:

> > Now, what's the common theme here? **Declarations should be separate from > > expressions.** > > Declarations and assignments are not the same thing. Ryan mostly meant "initialization" rather than "declaration", I suspect. In C's for() statement, the first clause in parentheses is initialization, the third is assignment. FWIW, I had been thinking the same thing (that what is really wanted is initialization clauses in loop statements) but had no concrete suggestions. Now I too have warmed to the binding expression approach (partly because Guido has, so I'm preparing for the inevitable :^), mostly because of Tim's "humorous observation" about use in printf debugging. The fact that there is this use case independent of block variable initialization (ie, in a loop or if statement) is quite attractive to me. It's true, as I think Antoine pointed out, that it's easy enough to define a wrapper function that prints a value and returns it.

That wasn't me, but I agree with the idea anyway :-)

Regards

Antoine.

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