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Object Programming scripts

Observer Pattern

... 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

Stateful Objects use Mix ins to define behaviour

If you want to implement stateful objects, which have a different set of behaviours according ... a class which is dynamically inherited by an object. The methods of the mix-in class are thus accessible through the object. This is a clean way of providing objects with standard interfaces. ...
Python

A meta class that provides behavior like Ruby

This script brings a Ruby-like class behavior. When a class is declared, it extends the old class if the class name exists already. ...
Python

ASTVisitor generator

This script parses the online documentation for compiler.ast and generate code for a skeletal ASTVisitor class that includes stubs for all of the various visitNODE functions that you might need in a visitor, along with comments in each function that list that node type's attributes. ...
Python

Drawing inheritance diagrams with Dot

Dot is a very nice 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 to display the MRO (Method Resolution Order) for complicate inheritance hierarchies. ...
Python

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

Function emulation using call

This script defines a simple but useful class that emulates a function to gracefully permit latent assignment. In other words, you can use the emulating class as a valid function in assignments with the ability to later associate a function to perform the actual operations. ...
Python

Maintenance free Signals implementation

This is a signals implementation for python. It is similar to the pydispatch module. This implementation 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

Memento Closure

The memento pattern is great for transaction-like processing. This script adds transactional semantics to methods. Methods decorated with @transactional will rollback to entry state upon exceptions. ...
Python

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