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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def best_match(self, matches):
 """ Find the most similar string to self.target. Given a list of candidate strings find the closest match to self.target, returning the best match with a score indicating closeness of match. :param matches: A list of candidate matches :returns: A tuple of (score, best_match) """

        best_match = None
        for match, message in matches:
            self.matcher.set_seq1(message)
            ratio = self.matcher.quick_ratio()
            if best_match is None or ratio >= best_match[0]:
                new_ratio = self.matcher.ratio()
                if best_match is None or new_ratio > best_match[0]:
                    best_match = (new_ratio, match)
        return best_match