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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 page(self, start_date=values.unset, end_date=values.unset, identity=values.unset, tag=values.unset, page_token=values.unset, page_number=values.unset, page_size=values.unset):
 """ Retrieve a single page of BindingInstance records from the API. Request is executed immediately :param date start_date: Only include usage that has occurred on or after this date :param date end_date: Only include usage that occurred on or before this date :param unicode identity: The `identity` value of the resources to read :param unicode tag: Only list Bindings that have all of the specified Tags :param str page_token: PageToken provided by the API :param int page_number: Page Number, this value is simply for client state :param int page_size: Number of records to return, defaults to 50 :returns: Page of BindingInstance :rtype: twilio.rest.notify.v1.service.binding.BindingPage """

        params = values.of({
            'StartDate': serialize.iso8601_date(start_date),
            'EndDate': serialize.iso8601_date(end_date),
            'Identity': serialize.map(identity, lambda e: e),
            'Tag': serialize.map(tag, lambda e: e),
            'PageToken': page_token,
            'Page': page_number,
            'PageSize': page_size,
        })

        response = self._version.page(
            'GET',
            self._uri,
            params=params,
        )

        return BindingPage(self._version, response, self._solution)