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Python scripts

Null Object Design Pattern

... 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 case where one member of some group of otherwise similar elements is special for whatever reason. Most often this results in conditional statements to ...
Python

The Singleton Pattern implemented with Python

... 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

Real class methods in Python

This script demonstrates 'real' class methods, like they are known from Smalltalk. Class methods implicitely receive the actual class as the first parameter. They are inherited by subclasses, and may as well be overridden. Class methods may return anything, although they are particularly useful as constructing, althbr >/ ...
Python

Restrictive APIs for Python

Python has no inherent provision for a restrictive API ... methods and variables outside an allowed set. Inexperienced Python programmers may fail to adhere to an agreed-upon API, directly accessing the private internals of a class. Adherence to defined APIs is a good thing. This script contains a  function that allows ...
Python

Debug runtime objects using gc get objects

Since Python 2.2 there is a handy function in the Garbage Collection Module called get_objects(). It gives back a list of all objects that are under control of the Garbeage Collector. This script implements a way you can extract informations of your application in runtime.The example dumps a list of ...
Python

Changing a closed over value in a cell

... which share a reference to the same variable. Python's syntax makes this impossible. Putting your changeable values inside a mutable object like a list-- it may occasionally happen that you wish you could change the closed-over values, found in "cell" objects in a function's func_closure tuple. This script will demonstrate a ...
Python

Classmethod emulation in python2 1

Class methods were introduced in python2.2. This script illustrates how the same effect can be achieved in python 2.1. ...
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

Interfaces

Interfaces script deals with the Interface concept in Python. ...
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

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