Senior Web Developer / Cerner Corporation / Kansas City, MO
Updated: 2012-01-28 22:51:19
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Voidspace The website , technical blog and projects of Michael Foord Home Blog Book IronPython Python Projects Python Articles Contact Python Programming , news on the Voidspace Python Projects and all things . techie Front page All By Date All By Category RSS Feed 1233 Callable object with state using generators It's often convenient to create callable objects that maintain some kind of state . In Python we can do this with objects that implement the call__ method and store the state as instance attributes . Here's the canonical example with a : counter class Counter object def init__ self start self value start def call__ self value self value self value 1 return value counter Counter 0 counter 0 counter 1 counter 2 Generators can be seen as objects that implement the iteration protocol