@property
    def only_manager(self):
        assert len(self.managers) == 1, MULTIPLE_MANAGERS_MESSAGE
        return list(self.managers.values())[0]
Draw an ellipse with a pen object.
dataset/ETHPy150Open galaxyproject/pulsar/pulsar/core.py/PulsarApp.only_manager--crossover with--dataset/ETHPy150Open gferreira/hTools2/Lib/hTools2/modules/primitives.py/ellipse