Get the Maximum Score — Python

# Time:  O(m + n)
# Space: O(1)

class Solution(object):
    def maxSum(self, nums1, nums2):
        """
        :type nums1: List[int]
        :type nums2: List[int]
        :rtype: int
        """
        MOD = 10**9+7
        i, j = 0, 0
        result, sum1, sum2 = 0, 0, 0,
        while i != len(nums1) or j != len(nums2):
            if i != len(nums1) and (j == len(nums2) or nums1[i] < nums2[j]):
                sum1 += nums1[i]
                i += 1
            elif j != len(nums2) and (i == len(nums1) or nums1[i] > nums2[j]):
                sum2 += nums2[j]
                j += 1
            else:
                result = (result + (max(sum1, sum2) + nums1[i])) % MOD
                sum1, sum2 = 0, 0
                i += 1
                j += 1
        return (result + max(sum1, sum2)) % MOD