[gt-users] python iterators

[Brent Pedersen]

hi, i've been looking at the python iterators and realized that the
iterating over featurenodes is not very idiomatic.
this is easily fixed by the patch below. it allows:

for feat in FeatureNodeIteratorDepthFirst(node):
     print feat.type


instead of the old:

dfi = FeatureNodeIteratorDepthFirst(node)
feat = dfi.next()
while feat:
    print feat.type
    feat = dfi.next()


i've fixed all the unit tests in this patch, though it may break some
scripts that rely on the old behavior...

-brent
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