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Methods defined here:
- __init__(self)
- Initialize the Event object
- visited(self, key, value=None)
- Check for or register visitation of the given key
key -- an opaque hashable value, normally the node and
field/event as a tuple.
value -- if provided, sets the current value, otherwise
signals that the current value should be returned
return value: previous key value (possibly None)
Data descriptors defined here:
- __dict__
- dictionary for instance variables (if defined)
- __weakref__
- list of weak references to the object (if defined)
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