Brian Quinlan added the comment:

This feature seems unnecessary to me but couldn't the implementation be 
simplified to work in terms of map? i.e. (pseudocode):

def filter(self, fn, iterable, timeout=None):
  l = list(iterable)
  return (item for (item, keep) in zip(l, self.map(fn, l, timeout)) if keep)

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue24195>
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