def is_first_page(self, page):

        return page is self._pages[0]
Internal helper to check for uninitialized properties.
dataset/ETHPy150Open enthought/pyface/pyface/wizard/wizard_controller.py/WizardController.is_first_page--crossover with--dataset/ETHPy150Open GoogleCloudPlatform/datastore-ndb-python/ndb/model.py/Model._check_initialized