不满足while循环的条件仍然循环

求各位god看看
正常输出不应该是[0,1]吗
为什么会继续循环输出[0,1,1,0]呢

class Solution(object):
    def twoSum(self, nums, target):
        self.nums = nums
        self.target = target
        output = []
        while len(output) <2:
            for i in range(len(nums)):
                number1 = nums[i]
                left = target - number1
                if left in nums:
                    output.append(i)
                    output.append(nums.index(left))
                    print(output)
                    print(len(output))
        
nums = [2,7,11,15]
target = 9
hello = Solution()
hello.twoSum(nums,target)

因为在while进行判断之前，已经往output列表里插入了四个数字
其实一个循环就够了，可以直接把while删了，然后在循环末尾加一个break语句
像这样：

class Solution(object):
    def twoSum(self, nums, target):
        self.nums = nums
        self.target = target
        output = []
        for i in range(len(nums)):
            number1 = nums[i]
            left = target - number1
            if left in nums:
                output.append(i)
                output.append(nums.index(left))
                print(output)
                print(len(output))
                break


nums = [2, 7, 11, 15]
target = 9
hello = Solution()
hello.twoSum(nums, target)

因为for循环啊，遍历了nums,有两个left满足if条件，output就有四个元素加入了
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