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Mailing List Script scripts

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

This script has a base Factory class that is meant 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

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

... to defined APIs is a good thing. This script contains a  function that allows a class to specify its API, and raise AttributeErrors for disallowed aify its A ...
Python

Extending the logging module

This script helps you in adding new format specifiers to the logging module. In this example, it's for the user name and the name of the function that logged the message. ...
Python

Debuging of object instantiation

If you are debugging a program, this script will help you to know if some special objects exist and where they came from. ...
Python

Debug runtime objects using gc get objects

... 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 all higher level objects. At first it gets the list of all objects, than tests if they are ...
Python

Changing a closed over value in a cell

... 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 way to actually change that value, so that functions which also close over that value ...
Python

Dictionary Mixin Framework

... few mapping methods for getting, setting, deleting, and listing keys. Also, a function is provided to incorporate the mixin at runtime so that code for existing modules need not be modified.By usmodules nixin as a superclass, you are free to overwrite any of these methods with your own and not ...
Python

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