Largest Odd Number in String LeetCode solution in Python

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class Solution:
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    def largestOddNumber(self, num: str) -> str:
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        indx = -1
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        n = len(num)
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        for i in range(n):
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            if int(num[i]) % 2 == 1:
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                indx = i
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        if indx == -1:
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            return ""
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        return num[: indx + 1]