Classes and routines that are common to various netaddr sub
modules.
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Subscriber
Abstract class defining interface expected by a Publisher that
concrete subclass instances register with to receive updates from.
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PrettyPrinter
Concrete Subscriber that uses the pprint module to format all data
from updates received writing them to any file-like object.
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Publisher
A 'push' publisher that maintains a list of Subscriber objects
notifying them of state changes when its subclasses encounter
events of interest.
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