Element Appearing More Than 25% In Sorted Array — Python

# Time:  O(logn)
# Space: O(1)

import bisect


class Solution(object):
    def findSpecialInteger(self, arr):
        """
        :type arr: List[int]
        :rtype: int
        """
        for x in [arr[len(arr)//4], arr[len(arr)//2], arr[len(arr)*3//4]]:
            if (bisect.bisect_right(arr, x) - bisect.bisect_left(arr, x)) * 4 > len(arr):
                return x
        return -1