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最新推荐文章于 2023-12-10 11:27:54 发布

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最新推荐文章于 2023-12-10 11:27:54 发布

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本文介绍如何使用Python生成器来创建序列的部分和。参考Blckknght的回答，我们还可以将None、0或空字符串等作为条件。例如，该方法可以应用于解决两数之和问题。

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create partial sum of sequence using generator. ref: Blckknght’s answer

def partial_sums(iterable):
    total = 0
    for i in iterable:
        total += i
        yield total

None and 0, ”, etc, as condition.
example, to solve two sum problem. below code

    def twoSum(self, nums, target):
        scanned = {}
        for i in range(len(nums)):
            # wrong if missing '!=None' in below line, wrong case, 
            # nums, target = [0,4,3,0], 0
            if scanned.get(nums[i])!=None:
                return scanned[nums[i]], i
            scanned[target - nums[i]] = i