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Python Classes scripts

Create objects from variable class names

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

Factorial

... 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 be the solution. ...
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

Wolfram style cellular automata

This is a little script that uses Python to generate the cellular automata that Wolfram discusses ... New Kind of Scilfram disquot;.The script uses the Python Imaging Library to render the output, but you could replace this with text or any other method of visualization. ...
Python

Fractal tree

... graphics. It is a good example of how Python's powerful data structures, combined with a vast body ... user friendly code. The code was tested with Python 2.3 and 2.4. ...
Python

Drawing inheritance diagrams with Dot

... graph description language developed at MIT. Combined with Python, it makes an ideal tool to automatically generate diagrams. This script produces beautiful inheritance diagrams for Python classes (and metaclasses too). In particular the recipe allows ...
Python

A class keeps a reference to it s instance

... script implements a base class, which allows derived classes to track instances in self.__instances__. It uses a WeakValueDictionary to store instance references. ...
Python

Maintenance free Signals implementation

This is a signals implementation for python. It is similar to the pydispatch module. This ... 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 manage themselves with the weakref module. Signals ...
Python

Extending Classes

This script contains two implementations for extending an exsisting class using metaclasses. ...
Python

Composite design pattern using dictionaries

... used to process hierarchical, tree-based data structures using Python dictionaries. ...
Python

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