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Dictionary Implementation scripts

The Singleton Pattern implemented with Python

This script contains a class 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

Dictionary Mixin Framework

This script makes it easy to provide a full dictionary interface to a class defining only a few ... iter functions. The reason for implementing the full dictionary interface is to maximize substitutability. Given code that was designed to work with a dictionary, an object of your class (with the mixin) can be substituted for the dictionary.Some modules like shelve implement a subset of the ...
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

Factory pattern

... that creates other objects.Factory is useful to separate implementation from interface. It adds a new indirection layer. When you want to instanciate an object you call its factory and the factory creates the instance. ...
Python

Tuples with Named Elements via Spawning

... attributes list for each instantiation of the tuple, this implementation 'Spawns' a derived tuple class that is taylored to the named attributes specified. And it is this Spawned class that is then used to instantiate tuples. This approach effectively separates the definition of the attribute names from the data specification. And in ...
Python

Factorial

... number and for negative numbers returns 1.The recursive implementation of 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 ...
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

Sparse

'sparse' is a matrix class based on a dictionary to store data using 2-element tuples (i,j) as keys (i is the row and j the column index). The common matrix operations such as 'dot' for the inner product, multiplication/division by a scalar, indexing/slicing, etc. are overloaded for convenience.When used in ...
Python

Fractal tree

... patterns at different scales. The code uses a dictionary to store the node coordinates as complex numbers and Tkinter for graphics. It is a good example of how Python's powerful data structures, combined with a vast body of modules can be used to write concise and user friendly code. The ...
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 ...
Python

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