def cluster_dumb(list, window, key, value):
"""The full O(N^2) clustering algorithm, but easier to verify correctness."""
return [
item for item in list if all(
abs(key(item) -
key(other)) >= window or value(item) >= value(other)
for other in list)
]
def is_heap(self): return all(self._cmp(i, (i - 1) / 2) == -1 for i in range(1, len(self._heap)))
