How to use the easypost.__init__.CreateResource function in easypost

continue

            rate_service = rate.service.lower()
            if len(services) > 0 and rate_service not in services:
                continue

            if lowest_rate is None or float(rate.rate) < float(lowest_rate.rate):
                lowest_rate = rate

        if lowest_rate is None:
            raise Error('No rates found.')

        return lowest_rate


class Rate(CreateResource):
    pass


class Refund(AllResource, CreateResource):
    pass


class Batch(AllResource, CreateResource):
    @classmethod
    def create_and_buy(cls, api_key=None, **params):
        requestor = Requestor(api_key)
        url = "%s/%s" % (cls.class_url(), "create_and_buy")
        wrapped_params = {cls.class_name(): params}
        response, api_key = requestor.request('post', url, wrapped_params)
        return convert_to_easypost_object(response, api_key)

def buy(self, **params):
        requestor = Requestor(self._api_key)
        url = "%s/%s" % (self.instance_url(), "buy")
        response, api_key = requestor.request('post', url, params)
        self.refresh_from(response, api_key)
        return self

    def cancel(self, **params):
        requestor = Requestor(self._api_key)
        url = "%s/%s" % (self.instance_url(), "cancel")
        response, api_key = requestor.request('post', url, params)
        self.refresh_from(response, api_key)
        return self


class Order(AllResource, CreateResource):
    def get_rates(self):
        requestor = Requestor(self._api_key)
        url = "%s/%s" % (self.instance_url(), "rates")
        response, api_key = requestor.request('get', url)
        self.refresh_from(response, api_key)
        return self

    def buy(self, **params):
        requestor = Requestor(self._api_key)
        url = "%s/%s" % (self.instance_url(), "buy")
        response, api_key = requestor.request('post', url, params)
        self.refresh_from(response, api_key)
        return self


class PickupRate(Resource):

def add_shipments(self, **params):
        requestor = Requestor(self._api_key)
        url = "%s/%s" % (self.instance_url(), "add_shipments")
        response, api_key = requestor.request('post', url, params)
        self.refresh_from(response, api_key)
        return self

    def create_scan_form(self, **params):
        requestor = Requestor(self._api_key)
        url = "%s/%s" % (self.instance_url(), "scan_form")
        response, api_key = requestor.request('post', url, params)
        self.refresh_from(response, api_key)
        return self


class PostageLabel(AllResource, CreateResource):
    pass


class Tracker(AllResource, CreateResource):
    @classmethod
    def create_list(cls, api_key=None, **params):
        requestor = Requestor(api_key)
        url = "%s/%s" % (cls.class_url(), "create_list")
        response, api_key = requestor.request('post', url, params)
        return True

    @classmethod
    def all_updated(cls, api_key=None, **params):
        requestor = Requestor(api_key)
        url = "%s/%s" % (cls.class_url(), "all_updated")
        response, api_key = requestor.request('get', url, params)

def create(cls, api_key=None, **params):
        requestor = Requestor(api_key)
        url = cls.class_url()
        response, api_key = requestor.request('post', url, params)
        return convert_to_easypost_object(response, api_key)


class Insurance(AllResource, CreateResource):
    pass


class CustomsItem(AllResource, CreateResource):
    pass


class CustomsInfo(AllResource, CreateResource):
    pass


class Parcel(AllResource, CreateResource):
    pass


class Shipment(AllResource, CreateResource):
    @classmethod
    def track_with_code(cls, api_key=None, **params):
        requestor = Requestor(api_key)
        url = "%s/%s" % (cls.class_url(), "track")
        response, api_key = requestor.request('get', url, params)
        return response

    def get_rates(self):