Re: Let's talk about order of assignment

[Oliver Kroth <oliver.kroth@...>]

> > Does anyone have an example of using the pathological case
> >
> > a,a,a=1,2,3
> >
> > or similar in real code (except as a coding error)? I can't think of a use
> > case for using the same variable more then once
> > on the left side of a multiple assignment.
> >
> > -- Mike
I had, although... One may say it was an coding error:

Coding an event queue using a binary heap, I wanted to to pick the first 
one (into node) andmove the last position into first while clearing the 
last position  ( node <- self[1} <- self[last] <- nil) in one statement:

    node, self[1], self[last], last         = self[1], self[last], nil, 
last-1

The code worked, funny enough, as long as more than one event was in the 
queue.
It did work better after I made four single assignments from it to 
enforce the execution order:

    node       = self[1]
    self[1]    = self[last]
    self[last] = nil
    last       = last-1

--
Oliver