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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 create(self, name, sources=None, destinations=None, services=None, action='allow', is_disabled=False, logical_interfaces=None, add_pos=None, after=None, before=None, comment=None):
 """ Create an Ethernet rule :param str name: name of rule :param sources: source/s for rule :type sources: list[str, Element] :param destinations: destination/s for rule :type destinations: list[str, Element] :param services: service/s for rule :type services: list[str, Element] :param str action: \|allow\|continue\|discard\|refuse\|blacklist :param bool is_disabled: whether to disable rule or not :param list logical_interfaces: logical interfaces by name :param int add_pos: position to insert the rule, starting with position 1. If the position value is greater than the number of rules, the rule is inserted at the bottom. If add_pos is not provided, rule is inserted in position 1. Mutually exclusive with ``after`` and ``before`` params. :param str after: Rule tag to add this rule after. Mutually exclusive with ``add_pos`` and ``before`` params. :param str before: Rule tag to add this rule before. Mutually exclusive with ``add_pos`` and ``after`` params. :raises MissingReuqiredInput: when options are specified the need additional setting, i.e. use_vpn action requires a vpn policy be specified. :raises CreateRuleFailed: rule creation failure :return: newly created rule :rtype: EthernetRule """

        rule_values = self.update_targets(sources, destinations, services)
        rule_values.update(name=name, comment=comment)
        rule_values.update(is_disabled=is_disabled)

        if isinstance(action, Action):
            rule_action = action
        else:
            rule_action = Action()
            rule_action.action = action

        if not rule_action.action in self._actions:
            raise CreateRuleFailed('Action specified is not valid for this '
                                   'rule type; action: {}'
                                   .format(rule_action.action))

        rule_values.update(action=rule_action.data)

        rule_values.update(self.update_logical_if(logical_interfaces))

        params = None
        
        href = self.href
        if add_pos is not None:
            href = self.add_at_position(add_pos)
        else:
            params = self.add_before_after(before, after)
        
        return ElementCreator(
            self.__class__,
            exception=CreateRuleFailed,
            href=href,
            params=params,
            json=rule_values)