def __init__(self, source, target):
        self.source = source
        self.target = target
        self.annotations = []
Fetches a list of all policy_classifiers for a tenant.
dataset/ETHPy150Open twisted/imaginary/imaginary/idea.py/Link.__init__--crossover with--dataset/ETHPy150Open openstack/python-group-based-policy-client/gbpclient/v2_0/client.py/Client.list_policy_classifiers