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Recursive Programming scripts

Just in time instantiation

JIT is a class for Just In Time instantiation of objects. Init is called only when the first attribute is either get or set. Then automatic delegation is used to front for the object. ...
Python

Memento design pattern in python

Memento design pattern in python script allows you to cache instances based on what arguments are passed to them. ...
Python

Simplified attribute accessors using overloading

This script presents an ideom for simplified accessors, that combines typical getter and setter functionality of an attribute into a single overloaded method, that instead of getATTRIBUTE and setATTRIBUTE can now just be called ATTRIBUTE. When called without arguments it acts as a getter and retrieves the attribute's value. When called ...
Python

Tuples with Named Elements via Spawning

Instead of requiring the named attributes list for each instantiation of the tuple, this implementation 'Spawns' a derived tuple class that is taylored to the named attributes specified. And it is this Spawned class that is then used to instantiate tuples. This approach effectively separates the definition of the attribute names from the ...
Python

Quasi Singleton Metaclass

In effect, this script provides a pattern for a set of quasi-singletons, identified by keyword. If no keyword is given, the default share is accessed. ...
Python

Create objects from variable class names

Sometimes you would want to create objects from various classes based on some condition (without using eval()). For example when parsing X(HT)ML files you want to handle some tags using specific classes. This script is an example in this sense. ...
Python

Factorial

... a number and for negative numbers returns 1.The recursive implementation of factorial is easy but using lambda keyword of python it becomes a bit tough as we can't use conditional if else in lambda. If a user wants to return a factorial function on the fly using lambda than this ...
Python

A tidy property idiom

This script suggests an idiom for property creation that avoids cluttering the class space with get/set/del methods that will not be used directly. Using thel methods idiom to create properties unnecessarily clutters the class space with get/set/del methods that will not be called directly by users of your class (although, of course, ...
Python

Observer Pattern

This is a Python implementation of the observer pattern. It defines a one-to many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. ...
Python

Stateful Objects use Mix ins to define behaviour

If you want to implement stateful objects, which have a different set of behaviours according to what state they are in, this requirement can be achieved with the use of mix-ins. A mix-in is a class which is dynamically inherited by an object. The methods of the mix-in class are thus ...
Python

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