1-liner to iterate over infinite sequence of integers?

[Peter Hansen]

Erik Max Francis wrote:
> The negative integers are being descriminated against!  I demand justice!
> 
>     def integers():
>         yield 0
>         x = 1
>         while True:
>             yield x
>             yield -x
>             x += 1
> 
> ... which is also not a bad demonstration of how the integers are 
> countably infinite.

For some reason I was unable to avoid seeing that one can save a yield 
there (not that they're a scarce resource, mind you):

def integers():
   x = 0
   while True:
     yield -x
     x += 1
     yield x

I know that shouldn't win any readability awards...

-Peter