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Code Listing by Rodney Drenth

Code 1-4 of 4   






Synchronizes access to methods of a class with either an instance or class specific
lock.



Provides is a module that gives support for implementing state machines. States are implemented as subclasses, derived from the state machine class. Methods that are state dependant or which cause transitions are declared using decorators....



The observer pattern is implemented using an observable descriptor.
One creates instances of observable in a class, which allows observers to
subscribe to changes in the observable. Assigning a value to the observable
causes the...



This is a threadsafe version of recipe 576979. A publish-subscribe (observer) pattern is implemented as a descriptor. Assigning a value notifies the observers.
Uses recipe 577105 as synchlock.py and recipe 576979 as Observer.py