Increasing Triplet Subsequence LeetCode solution in Python

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class Solution:
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    def increasingTriplet(self, nums: List[int]) -> bool:
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        first = second = float("inf")
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        for n in nums:
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            if n <= first:
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                first = n
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            elif n <= second:
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                second = n
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            else:
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                return True
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        return False