def size(self, idx):
    'Returns the size of a given cluster.\n\n        @param idx: the cluster in which we are interested.\n        '
    return len(self[idx])
Returns the size of a given cluster.

@param idx: the cluster in which we are interested.
def size(self, idx):
    'Returns the size of a given cluster.\n\n        @param idx: the cluster in which we are interested.\n        '
    return len(self[idx])