class Solution(object):
    def topKFrequent(self, nums, k):
        """
        :type nums: List[int]
        :type k: int
        :rtype: List[int]
        """
        freq = {}
        freq_list = []
        for num in nums:
            if num in freq:
                freq[num] = freq[num] + 1
            else:
                freq[num] = 1

    

        for key in freq.keys():
            freq_list.append((-freq[key], key))

        heapq.heapify(freq_list)
        topk = []
        for i in range(0, k):
            topk.append(heapq.heappop(freq_list)[1])
        return topk
		
	```