Leetcode_Python 442 数组中重复的数据

# 442
class Solution(object):
    def findDuplicates(self, nums):
        """
        :type nums: List[int]
        :rtype: List[int]
        """
        count =  [0 for i in range(0,len(nums))]
        for i in nums:
            count[i-1] += 1
        return_list = []
        for i,num in enumerate(count):
            if num == 2:
                return_list.append(i+1)
        return return_list
a = Solution()
a.findDuplicates([4,3,2,7,8,2,3,1])