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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 prepare_rules(self, attributes = [], ip_ranges = [], params = {}):
 """ Update the ruleset's rules by duplicating fields as required by the HTML ruleset generator :return: """

        for filename in self.rule_definitions:
            if filename in self.rules:
                for rule in self.rules[filename]:
                    rule.set_definition(self.rule_definitions, attributes, ip_ranges, params)
            else:
                self.rules[filename] = []
                new_rule = Rule(filename, self.rule_type, {'enabled': False, 'level': 'danger'})
                new_rule.set_definition(self.rule_definitions, attributes, ip_ranges, params)
                self.rules[filename].append(new_rule)