数组中出现次数超过一半的数字

# coding:utf-8
class Solution:
    def MoreThanHalfNum_Solution(self, numbers):
        # write code here
        if len(numbers) == 0:
            return 0
        if len(numbers) == 1:
            return numbers[0]
        d1 = {}
        for i in numbers:
            if i not in d1.keys():
                d1[i] = 1
            else:
                d1[i] += 1
        mid = len(numbers)//2
        for k,v in d1.items():
            if v > mid:
                return k
        return 0


p = Solution()
ret = p.MoreThanHalfNum_Solution([1,2,3,2,2,2,5,4,2])
print ret