[Python-ideas] Re: Making the for statement work better with nested functions

On 2/12/20 6:43 am, Paul Sokolovsky wrote:

That's why I don't make such claims, and instead making a very different one: that idea with absolute certainty will remove *one* of 50 problems which keep Python slow.

But without an implementation demonstrating an actual speed improvement, you're only speculating that the problem is, in fact, keeping Python slow.

I'm also not convinced that the proposed solution is necessary to remove the problem. A sufficiently smart JIT could notice, for example, that a particular function doesn't mutate its arguments and pass them in an optimised way, without needing any declarations.