Find the Difference of Two Arrays LeetCode solution in Python

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# Runtime: 953 ms (Top 29.31%) | Memory: 14.3 MB (Top 52.22%)
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class Solution(object):
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    def findDifference(self, nums1, nums2):
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        """
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        :type nums1: List[int]
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        :type nums2: List[int]
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        :rtype: List[List[int]]
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        """
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        a = []
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        for i in range(len(nums1)):
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            if nums1[i] not in nums2:
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                a.append(nums1[i])
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        b = []
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        for i in range(len(nums2)):
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            if nums2[i] not in nums1:
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                b.append(nums2[i])
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        c = [list(set(a))] + [list(set(b))]
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        return c