def has_credentials(self):
    return self.credentials is not None and not self.credentials.invalid
Refresh the items in the combo box.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/google-api-python-client/oauth2client/appengine.py/OAuth2Decorator.has_credentials--crossover with--dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/qt/qt_object_combo.py/QtObjectCombo.refresh_items