python 列表返回重复数据的下标

class Solution(object):
    def searchRange(self, nums, target):
        """
        :type nums: List[int]
        :type target: int
        :rtype: List[int]
        """
        flag = 0
        lis = []
        for i in range(nums.count(target)):
            sec = flag
            flag = nums[flag:].index(target)
            lis.append(flag + sec)
            flag = lis[-1:][0] + 1
        return lis
so = Solution()
print so.searchRange([5,7,7,8,8,10,8], 8)