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Code Listing by Peter Donis

Code 1-4 of 4   






A wrapper class for generators that "memoizes" them, so that even
if the generator is realized multiple times, each term only gets
computed once (after that the result is simply returned from a
cache).



A decorator for generators that makes them indexable like a
sequence.



A class decorator that ensures that only one instance of
the class exists for each distinct set of constructor
arguments.

Note that if a decorated class is subclassed, each subclass is cached separately. (This is because each...



This is a decorator wrapper class to delay decorating the base function until it is actually invoked. This can be useful when decorating ordinary functions if some decorator parameters depend on data that is only known at function invocation. It...