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Simulation Algorithms scripts

A class keeps a reference to it s instance

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

Constraint based Sudoku Solver

This code uses the constraint package to solve sudoku puzzles. It's designed to be flexible and tested with 9x9 puzzles with 1-9 as possible values. In theory it should be able to solve puzzles of different sizes comprised of letters or symbols instead of numbers. Requirements: · constraint package ...
Python

Ensuring a name definition in a module namespace

This script ensures that a name exists in a target namespace. If it does not, make it available in the target namespace using the given definition. The target should be a namespace dictionary (presumably for a module, see the discussion below otherwise). The default target is __builtins__ (specificially, __builtins__.__dict__). ...
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

Getting SYSTEM environment variable under Windows

This script allows you to get SYSTEM environment value, as if running under Service or SYSTEM account.As you can see in Windows Control Panel 'System' applet there are two groups of environment variables: USER and SYSTEM. This script presents a function for retrieve SYSTEM variable value.  ...
Python

Static or Class Methods

This script implements class methods that do not require an object instance. ...
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 case ...
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

Get system language dependent paths on windows

This module provides a few functions to retrieve the path names of some windows system directories from the registry and the environment. These path names can be different depending on OS version, installation language, current user and personal setup. Because of this, they should not be included statically in your program. ...
Python

Basic Linear Algebra Matrix

This script defines the Matrix class, an implementation of a linear algebra matrix. Arithmetic operations, trace, determinant, and minors are defined for it. This is a lightweight alternative to a numerical Python package for people who need to do basic linear algebra. Vectors are implemented as 1xN and Nx1 matricies. There is ...
Python

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