Largest 3-Same-Digit Number in String LeetCode solution in Python

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class Solution:
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    def largestGoodInteger(self, n: str) -> str:
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        return max(
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            n[i - 2 : i + 1] if n[i] == n[i - 1] == n[i - 2] else ""
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            for i in range(2, len(n))
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        )