def __init__(self, request_id, topic, on_reply, handler):
        Request.__init__(self, request_id, on_reply)
        self.topic = topic
        self.handler = handler
Loops through the addresses, collapsing concurrent netblocks.
dataset/ETHPy150Open crossbario/autobahn-python/autobahn/wamp/request.py/SubscribeRequest.__init__--crossover with--dataset/ETHPy150Open Exa-Networks/exabgp/lib/exabgp/dep/ipaddress.py/_collapse_addresses_recursive