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Sif Implementation scripts

Clean implementation for Ordered Dictionary

... the order in which items are added. This implementation uses much less code than the others by extending not well-known class DictMixin. ...
Python

Null Object Design Pattern

This script is a sample implementation of the 'Null Object' design pattern. Roughly, the goal with Null objects is to provide an 'intelligent' replacement for the often used primitive data type None in Python or Null (or Null pointers) in other languages. These are used for many purposes including the important ...
Python

AbstractFactory

... to be subclassed and then define a default implementation to return, as well as module's to search for the class implementation. ...
Python

The Singleton Pattern implemented with Python

This script contains a class that shows how to implement the singleton pattern in Python. A singleton is a class that makes sure only one instance of it is ever created. Typically such classes are used to manage resources that by their very nature can only exist once. ...
Python

Yet another Set class for Python

This script is a pure Pythonic implementation of a set class. The syntax and methods implemented are, for the most part, borrowed from PEP 218. ...
Python

Factory pattern

... that creates other objects.Factory is useful to separate implementation from interface. It adds a new indirection layer. When you want to instanciate an object you call its factory and the factory creates the instance. ...
Python

Tuples with Named Elements via Spawning

... 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 data specification. And in ...
Python

Factorial

... 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 may ...
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

Maintenance free Signals implementation

This is a signals implementation for python. It is similar to the pydispatch module. This implementation enables you to create Signals as members of classes, as globals, or as locals. You may connect any number of functions or class methods to any signal. Connections ...
Python

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