Count Number of Pairs With Absolute Difference K LeetCode solution in Python

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class Solution:
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    def countKDifference(self, nums: List[int], k: int) -> int:
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        seen = defaultdict(int)
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        counter = 0
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        for num in nums:
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            tmp, tmp2 = num - k, num + k
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            if tmp in seen:
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                counter += seen[tmp]
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            if tmp2 in seen:
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                counter += seen[tmp2]
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            seen[num] += 1
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        return counter