TOPk实现(python)

import heapq


class TopK:

    def __init__(self, iterable, k):
        self.minheap = []
        self.capacity = k
        self.iterable = iterable

    def push(self, val):
        if len(self.minheap) >= self.capacity:
            min_val = self.minheap[0]
            if val < min_val: 
                pass
            else:
                heapq.heapreplace(self.minheap, val)  
        else:
            heapq.heappush(self.minheap, val)  
    def get_topk(self):
        for val in self.iterable:
            self.push(val)
        return self.minheap


def test():
    import random
    i = list(range(1000))  
    random.shuffle(i)
    _ = TopK(i, 10)
    print(_.get_topk())  

if __name__ == ‘__main__‘:
    test()