【python】Top K Frequent Elements

class Solution(object):
    def topKFrequent(self, nums, k):
        """
        :type nums: List[int]
        :type k: int
        :rtype: List[int]
        """
        a = {}        
        for i in range(len(nums)):
            a[nums[i]] = 0
        for i in range(len(nums)):
            a[nums[i]] += 1
        # sorted 返回一个list[turple]
        # turple 是以（）识别的，list是[]
        b = sorted(a.items(),key = lambda x:x[1],reverse = True)
        print(b)
        # 对 b 进行迭代遍历
        p = 0
        l = []
        for i in range(len(b)):
            if p == k:
                break
            l.append(b[i][0])
            p += 1
        return l