Re: python3: 'where' keyword

[Andrey Tatarinov]

Bengt Richter wrote:
It also allows the necessary but uninteresting setup for an expression 
to be moved "out of the way", bringing the expression that does the real 
work to prominence.
Killer app for this keyword:
class C(object):
 x = property(get, set) where:
   def get(self):
     return "Silly property"
   def set(self, val):
     self.x = "Told you it was silly"
Yes, that is cool and it _is_ an interesting idea. Are suites nestable? E.g., is this legal?
...
And, is the whole thing after the '=' an expression? E.g.,
  x = ( foo(x) where:
         x = math.pi/4.0
      ) where:
         def foo(x): print 'just for illustration', x
or is this legal?
  for y in ([foo(x) for x in bar] where:
                 bar = xrange(5)
            ): baz(y) where:
                def baz(arg): return arg*2
Not trying to sabotage the idea, really, just looking for clarification ;-)
yes, all your examples are correct. And that's the way I'd like to use 
this feature.
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