Class Observer

The observer design pattern base class.

Instance Methods

__init__(self, name='unknown')
Set up the object.

notify(self)
Notify all observers of the state change.

register(self, key, method, method_name=None)
Register a method to be called when the state changes.

reset(self)
Reset the object.

unregister(self, key)
Unregister the method corresponding to the key.

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Properties

Inherited from object: __class__

Method Details

__init__(self, name='unknown')
(Constructor)

Set up the object.

Parameters:

• name (str) - The special name for the observer object, used in debugging.

Overrides: object.__init__

register(self, key, method, method_name=None)

Register a method to be called when the state changes.

Parameters:

• key (str) - The key to identify the observer's method.
• method (method) - The observer's method to be called after a state change.
• method_name (str or None) - The optional method name used in debugging printouts.

unregister(self, key)

Unregister the method corresponding to the key.

Parameters:

• key (str) - The key to identify the observer's method.