[Python-ideas] fork

[Andrew Barnert]

On Aug 11, 2015, at 06:54, Sven R. Kunze <srkunze at mail.de> wrote:
> 
> Co-workers proposed using function scopes as the ultimate evaluation scope. That is when a function returns a ResultProxy, it gets evaluated. However, I have absolutely no idea how to do this as I couldn't find any __returned__ hook or something.

I'm not sure I completely understand what you're looking for here.

If you just want a hook that gets called whenever a function returns, just write a decorator that calls the real function then does the hook thing:

    def hookify(func):
        @wraps
        def wrapper(*args, **kwargs):
            result = func(*args, **kwargs)
            do_hook_stuff()
            return result
        return wrapper

(Or, if you want to hook both raising and returning, use a finally.)

But I'm not sure what good that would do anyway. If you unwrap futures every time they're returned, they're not doing anything useful as futures in the first place; you might as well just return the values directly.