Find Triangular Sum of an Array LeetCode solution in Python

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class Solution(object):
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    def triangularSum(self, nums):
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        while len(nums) > 1:
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            arr = []
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            for i in range(len(nums) - 1):
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                arr.append((nums[i] + nums[i + 1]) % 10)
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            nums = arr
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        return nums[0]