Top-rated recipes tagged "object"

Simple tool for simulating classes using closures and nested scopes (Python)

2012-04-11T06:21:18-07:00

Python recipe 578091 by Raymond Hettinger (closure, object, oriented). Revision 9.

Closured-based alternative to normal classes. Allows a faster, cleaner coding style at the expense of some functionality.

A Simpler Namespace Class (Python)

2013-02-14T17:42:24-08:00

Python recipe 578141 by Eric Snow (namespaces, object). Revision 3.

A very simple, attribute-based namespace type (and one offspring). Everyone's written one of these...

Simple graph algorithms with a modular design (Python)

2011-04-21T13:40:32-07:00

Python recipe 577668 by jimmy2times (algorithms, breadth, depth, directed, first, graph, object, oriented, python, search, theory, undirected, visit). Revision 7.

The purpose of this recipe is to look at algorithmic graph theory from an object-oriented perspective.

A graph is built on top of a dictionary indexed by its vertices, each item being the set of neighbours of the key vertex. This ensures that iterating through the neighbours of a vertex is still efficient in sparse graphs (as with adjacency lists) while at the same time checking for adjacency is expected constant-time (as with the adjacency matrix).

Any valid class of graph must implement the interface defined by AbstractGraph.

A generic search algorithm takes as input a graph, source and target vertices and a queue. A queue must implement the methods Q.get(), Q.put() and Q.empty() in such a way to get the desired order in visiting the vertices.

Given this pattern, breadth-first and depth-first search are essentially defined by the corresponding expansion policies: the first one uses an actual FIFO queue, the second one a LIFO queue (or stack).

Python method chaining examples (Python)

2016-02-25T19:40:33-08:00

Python recipe 580616 by Vasudev Ram (chaining, methods, object, oop, python).

This recipe shows a few examples of doing method chaining in Python.

extending xrange to support slicing and indexing (Python)

2012-03-13T16:13:16-07:00

Python recipe 578070 by Garrett (object, python, xrange).

an object which extends the xrange object to support slicing and indexing (simple)

XML To Python object(next generation) with real life example: fetching US Treasure Curve (Python)

2012-02-14T01:24:28-08:00

Python recipe 578032 by Boris Kats (object, python, xml). Revision 11.

This middle sized python class will populate himself from any xml with reasonable restrictions.

CLOS-like around/before/after auxiliary methods (Python)

2011-08-25T22:59:22-07:00

Python recipe 577859 by Jan Kaliszewski (auxiliary, class, clos, decorator, inheritance, method, object, super).

This module provides an easy way to define and use your own around/before/after auxiliary methods, similar to those used in CLOS (Common Lisp Object System).

Fnct.D, comprehensive Bash-shell coding scheme. (Bash)

2010-11-01T00:29:09-07:00

Bash recipe 577446 by Patrick Riendeau (bash, object, oop, oriented, shell, system).

A Bash compromising shell-module to pre-introduce object-oriented Bash-code.

Object snoop - experiment with Python special methods (Python)

2010-09-05T17:54:50-07:00

Python recipe 577383 by Wai Yip Tung (metaprogramming, methods, object).

In Python, classes can define their own behavior with respect to language operators. For example, if a class defines __getitem__(), then x[i], where x is an instance of the clas, will be execute by a call to x.__getitem__(i).

While Python has an extensive documentation on the special methods, reading a specification may not be the best way to reveal the intricate details. object_snoop allows user to observe how Python expressions and statements are translated into special method calls. object_snoop defines most special methods. It simple print a trace and returns a fixed but sensible result. Users are invited to build complex expressions to experiment how Python special methods work.

Object Wrapper (Python)

2010-05-05T17:02:42-07:00

Python recipe 577215 by Dmitry (decorator, object, wrapper).

There is classical wrapper on Python language. If you have only object and can't change object generation you can use this class.

Immutable object(subclass) (Python)

2010-04-23T08:30:50-07:00

Python recipe 577207 by Dmitry (immutable, object). Revision 2.

Useful class and decorator for create immutable objects. Decorator mutablemethod used for define mutable methods.