Largest Substring Between Two Equal Characters LeetCode solution in Python

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class Solution:
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    def maxLengthBetweenEqualCharacters(self, s: str) -> int:
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        last, ans = {}, -1
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        for i, c in enumerate(s):
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            if c not in last:
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                last[c] = i
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            else:
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                ans = max(ans, i - last[c] - 1)
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        return ans