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)