[Python-3000] end scope of iteration variables after loop

[Nicholas T]

hello all,

   A few times in practice I have been tripped up by how Python keeps
variables in scope after a loop--and it wasn't immediately obvious what the
problem was. I think it is one of the ugliest and non-intuitive features,
and hope some others agree that it should be changed in py3k.

>>> for a in range(11): pass
...
>>> print(a)
10

Thanks,
Nicholas
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