Pythonically-expressed nested-loop break?

[Oren Tirosh]

Now that we have nested scopes there is a simple way to achieve a similar
effect: use nested functions and break out of the internal function with a 
return statement.  

It's not quite as flexible as your proposal because it doesn't allow 
breaking out to an arbirary level from any location in the loop but it's 
quite readable and should probably be enough in practice.

	Oren