Break a Palindrome LeetCode solution in Python

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class Solution(object):
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    def breakPalindrome(self, palindrome):
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        """
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        :type palindrome: str
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        :rtype: str
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        """
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        s = palindrome
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        palindrome = [ch for ch in s]
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        if len(palindrome) == 1:
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            return ""
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        for i in range(len(palindrome) // 2):
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            if palindrome[i] != "a":
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                palindrome[i] = "a"
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                return "".join(palindrome)
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        palindrome[-1] = "b"
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        return "".join(palindrome)