Number of Sub-arrays With Odd Sum LeetCode solution in Python

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class Solution:
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    def numOfSubarrays(self, arr: List[int]) -> int:
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        ce, co = 0, 0
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        s = 0
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        for x in arr:
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            if x % 2 == 0:
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                ce += 1
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            else:
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                old_co = co
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                co = ce + 1
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                ce = old_co
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            s += co
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        return s % (10**9 + 7)