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C And Python scripts

Null Object Design Pattern

... the often used primitive data type None in Python or Null (or Null pointers) in other languages. ... in conditional statements to distinguish between ordinary elements and the primitive Null value. ...
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

... 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 that blocks accesses to methods and variables outside an allowed set. Inexperienced Python programmers may fail to adhere to an agreed-upon ... that allows a class to specify its API, and raise AttributeErrors for disallowed aify its A ...
Python

Debug runtime objects using gc get objects

Since Python 2.2 there is a handy function in the ... objects, than tests if they are higher level and in the end it it tests if it is not in the list of objects that are more or less always there. ...
Python

Changing a closed over value in a cell

... it is possible to change a closed-over value and have the change visible in other closures 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 ...
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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