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Pastebin Script 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

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

Auto Incrementer Example of call and yield

This script will automatically return the next integer. It starts with 0. This is an example of how to make a generator and how to make a callable object. ...
Python

Memento Closure

... 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

Caching object creation

This script contains many recipes to memoize functions. Using this script you can cache object creation, i.e. __new__ and __init__ methods are called only when n.e. __newt;br >/ ...
Python

Call a function method X times per second

This simple generator function is used to call a function X times per second. ...
Python

Extending Classes

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

Remove duplicates from a sequence

... hashable, and whether they support full comparisons. This script defines the unique() function that tries three methods, from fastest to slowest, letting runtime exceptions pick the best method available for the sequence at hand. ...
Python

Access Cairo surface from numpy and pygame

This script aliases the memory from a cairo surface so that you can manipulate the bits as a numpy array, or display/manipulate the image in pygame. ...
Python

Composite design pattern using dictionaries

The script illustrates the composite design pattern by using hierarchical dictionaries. It can be used to process hierarchical, tree-based data structures using Python dictionaries. ...
Python

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