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alecbz/gist:9651803

Created March 19, 2014 21:30
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gistfile1.py
buckets = defaultdict(list)
for z, root in root_from.iteritems():
closest = next((k for k in buckets if abs(k - root) < 1e-3), None)
if closest:
buckets[closest].append(z)
else:
buckets[root].append(z)
roots = buckets.keys()
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