def __init__(self, tasker, workflow, required_labels=None):
        # call parent constructor
        super(AssertLabelsPlugin, self).__init__(tasker, workflow)

        self.required_labels = required_labels or ['Name', 'Version', 'Release']
constructor
dataset/ETHPy150Open projectatomic/atomic-reactor/atomic_reactor/plugins/pre_assert_labels.py/AssertLabelsPlugin.__init__