How to use the tableauserverclient.datetime_helpers.parse_datetime function in tableauserverclient

def test_get_materializeviews_tasks(self):
        with open(GET_XML_MATERIALIZEVIEWS_TASK, "rb") as f:
            response_xml = f.read().decode("utf-8")
        with requests_mock.mock() as m:
            m.get('{}/{}'.format(
                self.server.tasks.baseurl, TaskItem.Type.MaterializeViews), text=response_xml)
            all_tasks, pagination_item = self.server.tasks.get(task_type=TaskItem.Type.MaterializeViews)

        task = all_tasks[0]
        self.assertEqual('a462c148-fc40-4670-a8e4-39b7f0c58c7f', task.target.id)
        self.assertEqual('workbook', task.target.type)
        self.assertEqual('b22190b4-6ac2-4eed-9563-4afc03444413', task.schedule_id)
        self.assertEqual(parse_datetime('2019-12-09T22:30:00Z'), task.schedule_item.next_run_at)
        self.assertEqual(parse_datetime('2019-12-09T20:45:04Z'), task.last_run_at)

def _parse_element(schedule_xml, ns):
        id = schedule_xml.get('id', None)
        name = schedule_xml.get('name', None)
        state = schedule_xml.get('state', None)
        created_at = parse_datetime(schedule_xml.get('createdAt', None))
        updated_at = parse_datetime(schedule_xml.get('updatedAt', None))
        schedule_type = schedule_xml.get('type', None)
        frequency = schedule_xml.get('frequency', None)
        next_run_at = parse_datetime(schedule_xml.get('nextRunAt', None))
        end_schedule_at = parse_datetime(schedule_xml.get('endScheduleAt', None))
        execution_order = schedule_xml.get('executionOrder', None)

        priority = schedule_xml.get('priority', None)
        if priority:
            priority = int(priority)

        interval_item = None
        frequency_detail_elem = schedule_xml.find('.//t:frequencyDetails', namespaces=ns)
        if frequency_detail_elem is not None:
            interval_item = ScheduleItem._parse_interval_item(frequency_detail_elem, frequency, ns)

        return id, name, state, created_at, updated_at, schedule_type, \
            next_run_at, end_schedule_at, execution_order, priority, interval_item

    @staticmethod
    def _parse_element(datasource_xml):
        id = datasource_xml.get('id', None)
        name = datasource_xml.get('name', None)
        datasource_type = datasource_xml.get('type', None)
        content_url = datasource_xml.get('contentUrl', None)
        created_at = parse_datetime(datasource_xml.get('createdAt', None))
        updated_at = parse_datetime(datasource_xml.get('updatedAt', None))

        tags = None
        tags_elem = datasource_xml.find('.//t:tags', namespaces=NAMESPACE)
        if tags_elem is not None:
            tags = TagItem.from_xml_element(tags_elem)

        project_id = None
        project_name = None
        project_elem = datasource_xml.find('.//t:project', namespaces=NAMESPACE)
        if project_elem is not None:
            project_id = project_elem.get('id', None)
            project_name = project_elem.get('name', None)

        owner_id = None
        owner_elem = datasource_xml.find('.//t:owner', namespaces=NAMESPACE)
        if owner_elem is not None:

    @staticmethod
    def _parse_element(datasource_xml):
        id = datasource_xml.get('id', None)
        name = datasource_xml.get('name', None)
        datasource_type = datasource_xml.get('type', None)
        content_url = datasource_xml.get('contentUrl', None)
        created_at = parse_datetime(datasource_xml.get('createdAt', None))
        updated_at = parse_datetime(datasource_xml.get('updatedAt', None))

        tags = None
        tags_elem = datasource_xml.find('.//t:tags', namespaces=NAMESPACE)
        if tags_elem is not None:
            tags = TagItem.from_xml_element(tags_elem)

        project_id = None
        project_name = None
        project_elem = datasource_xml.find('.//t:project', namespaces=NAMESPACE)
        if project_elem is not None:
            project_id = project_elem.get('id', None)
            project_name = project_elem.get('name', None)

        owner_id = None
        owner_elem = datasource_xml.find('.//t:owner', namespaces=NAMESPACE)

def _parse_element(schedule_xml, ns):
        id = schedule_xml.get('id', None)
        name = schedule_xml.get('name', None)
        state = schedule_xml.get('state', None)
        created_at = parse_datetime(schedule_xml.get('createdAt', None))
        updated_at = parse_datetime(schedule_xml.get('updatedAt', None))
        schedule_type = schedule_xml.get('type', None)
        frequency = schedule_xml.get('frequency', None)
        next_run_at = parse_datetime(schedule_xml.get('nextRunAt', None))
        end_schedule_at = parse_datetime(schedule_xml.get('endScheduleAt', None))
        execution_order = schedule_xml.get('executionOrder', None)

        priority = schedule_xml.get('priority', None)
        if priority:
            priority = int(priority)

        interval_item = None
        frequency_detail_elem = schedule_xml.find('.//t:frequencyDetails', namespaces=ns)
        if frequency_detail_elem is not None:
            interval_item = ScheduleItem._parse_interval_item(frequency_detail_elem, frequency, ns)

        return id, name, state, created_at, updated_at, schedule_type, \

def _parse_element(schedule_xml, ns):
        id = schedule_xml.get('id', None)
        name = schedule_xml.get('name', None)
        state = schedule_xml.get('state', None)
        created_at = parse_datetime(schedule_xml.get('createdAt', None))
        updated_at = parse_datetime(schedule_xml.get('updatedAt', None))
        schedule_type = schedule_xml.get('type', None)
        frequency = schedule_xml.get('frequency', None)
        next_run_at = parse_datetime(schedule_xml.get('nextRunAt', None))
        end_schedule_at = parse_datetime(schedule_xml.get('endScheduleAt', None))
        execution_order = schedule_xml.get('executionOrder', None)

        priority = schedule_xml.get('priority', None)
        if priority:
            priority = int(priority)

        interval_item = None
        frequency_detail_elem = schedule_xml.find('.//t:frequencyDetails', namespaces=ns)
        if frequency_detail_elem is not None:
            interval_item = ScheduleItem._parse_interval_item(frequency_detail_elem, frequency, ns)

def _parse_element(user_xml, ns):
        id = user_xml.get('id', None)
        name = user_xml.get('name', None)
        site_role = user_xml.get('siteRole', None)
        last_login = parse_datetime(user_xml.get('lastLogin', None))
        external_auth_user_id = user_xml.get('externalAuthUserId', None)
        fullname = user_xml.get('fullName', None)
        email = user_xml.get('email', None)
        auth_setting = user_xml.get('authSetting', None)

        domain_name = None
        domain_elem = user_xml.find('.//t:domain', namespaces=ns)
        if domain_elem is not None:
            domain_name = domain_elem.get('name', None)

        return id, name, site_role, last_login, external_auth_user_id, fullname, email, auth_setting, domain_name

def _parse_element(datasource_xml, ns):
        id_ = datasource_xml.get('id', None)
        name = datasource_xml.get('name', None)
        datasource_type = datasource_xml.get('type', None)
        content_url = datasource_xml.get('contentUrl', None)
        created_at = parse_datetime(datasource_xml.get('createdAt', None))
        updated_at = parse_datetime(datasource_xml.get('updatedAt', None))
        certification_note = datasource_xml.get('certificationNote', None)
        certified = str(datasource_xml.get('isCertified', None)).lower() == 'true'

        tags = None
        tags_elem = datasource_xml.find('.//t:tags', namespaces=ns)
        if tags_elem is not None:
            tags = TagItem.from_xml_element(tags_elem, ns)

        project_id = None
        project_name = None
        project_elem = datasource_xml.find('.//t:project', namespaces=ns)
        if project_elem is not None:
            project_id = project_elem.get('id', None)
            project_name = project_elem.get('name', None)

        owner_id = None

def _parse_element(workbook_xml, ns):
        id = workbook_xml.get('id', None)
        name = workbook_xml.get('name', None)
        content_url = workbook_xml.get('contentUrl', None)
        created_at = parse_datetime(workbook_xml.get('createdAt', None))
        updated_at = parse_datetime(workbook_xml.get('updatedAt', None))

        size = workbook_xml.get('size', None)
        if size:
            size = int(size)

        show_tabs = string_to_bool(workbook_xml.get('showTabs', ''))

        project_id = None
        project_name = None
        project_tag = workbook_xml.find('.//t:project', namespaces=ns)
        if project_tag is not None:
            project_id = project_tag.get('id', None)
            project_name = project_tag.get('name', None)

        owner_id = None