Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold LeetCode solution in Python

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class Solution:
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    def numOfSubarrays(self, arr: List[int], k: int, threshold: int) -> int:
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        wstart = wsum = count = 0
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        for wend in range(len(arr)):
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            wsum += arr[wend]
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            if wend >= k:
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                wsum -= arr[wstart]
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                wstart += 1
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            if (wsum // k) >= threshold and (wend - wstart + 1) == k:
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                count += 1
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        return count