Number of Zero-Filled Subarrays LeetCode solution in Python

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class Solution:
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    def zeroFilledSubarray(self, nums: List[int]) -> int:
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        number_of_zerosubs = 0
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        counter = 0
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        for i in nums:
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            if not i:
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                counter += 1
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            elif counter:
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                number_of_zerosubs += sum(range(1, counter + 1))
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                counter = 0
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        if not nums[-1]:
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            number_of_zerosubs += sum(range(1, counter + 1))
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        return number_of_zerosubs