On Apr 20, 2005, at 5:43 AM, Paul Moore wrote:
and the substitution of
would become something like
def __block(): CODE EXPR(__block)
The question of whether assignments within CODE are executed within a new namespace, as this implies, or in the surrounding namespace, remains open. I can see both as reasonable (new namespace = easier to describe/understand, more in line with decorators, probably far easier to implement; surrounding namespace = probably more useful/practical...)
If it was possible to assign to a variable to a variable bound outside your function, but still in your lexical scope, I think it would fix this issue. That's always something I've thought should be possible, anyways. I propose to make it possible via a declaration similar to 'global'.
E.g. (stupid example, but it demonstrates the syntax): def f(): count = 0 def addCount(): lexical count count += 1 assert count == 0 addCount() assert count == 1
Then, there's two choices for the block decorator: either automatically mark all variable names in the immediately surrounding scope "lexical", or don't. Both of those choices are still consistent with the block just being a "normal function", which I think is an important attribute.