Popular recipes tagged "classes" but not "inheritance"

Implementing class-based callbacks in Python (Python)

2017-04-20T23:34:50-07:00

Python recipe 580788 by Vasudev Ram (callbacks, classes, functions, methods, objects, programming, python).

This is a follow-on to this recently posted recipe:

Implementing function-based callbacks in Python: https://code.activestate.com/recipes/580787-implementing-function-based-callbacks-in-python/?in=user-4173351

This new recipe shows how to create and use callbacks in Python, using classes with methods, instead of plain functions, as was done in the recipe linked above. All other points such as reasons and benefits for using callbacks, are more or less the same as mentioned in the previous recipe, except that class instances can carry state around, so to that extent, the two approaches are different.

https://jugad2.blogspot.in/2017/04/python-callbacks-using-classes-and.html

Money Game (Python)

2014-12-22T23:38:38-08:00

Python recipe 578988 by Lance Spence (classes, games).

I created this simple program as a possible start to something larger while I continue to learn Python. It's a simple program that can be used to help young kids learn to count change in US currency.

Tracking Child Classes (Python)

2012-05-30T10:00:21-07:00

Python recipe 578137 by Evert van de Waal (child, classes).

This recipe allows a base class to keep track of the child classes that inherit from it using a metaclass.

Simple Abstract "Constants" to Use When @abstractproperty is Overkill or Misleading (Python)

2011-08-12T23:35:45-07:00

Python recipe 577761 by Eric Snow (attributes, classes).

Use these instead of abstract properties when you don't plan on the abstract attribute being implemented with a property. And you can still give your attribute a docstring!

Calculate the MRO of a class (Python)

2011-06-11T08:31:09-07:00

Python recipe 577748 by Steven D'Aprano (c3, classes, method, mro, order, resolution).

This function allows you to calculate the Method Resolution Order (MRO, or sometimes linearization) of a class or base classes. This is the so-called "C3" algorithm, as used by Python (new-style classes, from version 2.3 and higher). The MRO is the order of base classes that Python uses to search for methods and attributes. For single inheritance, the MRO is obvious and straight-forward and not very exciting, but for multiple inheritance it's not always obvious what the MRO should be.

Turn a Function Into a Class (Python)

2011-10-05T18:38:43-07:00

Python recipe 577822 by Eric Snow (classes, functions).

The only catch is that the function has to return locals() at the end. And it doesn't do the __prepare__ part of 3.x metaclasses.

Make a Class's Name Available in its Definition Body (Python)

2011-08-04T21:38:40-07:00

Python recipe 577813 by Eric Snow (classes).

Since a class object is created after the body is executed, it can't be available to the class body. Even the name is unavailable, at least by default. However, you can use the __prepare__() method in a metaclass to stick it in there. This recipe is a simple demonstration of how.

Trace decorator for debugging (Python)

2011-01-24T18:40:51-08:00

Python recipe 577551 by Kevin L. Sitze (classes, debug, debugging, decorators, functions, inspection, modules, trace). Revision 2.

This package provides a decorator for tracing function and method calls in your applications. The tracing capabilities are managed through the logging package, and several mechanisms are provided for controlling the destination of the trace output.

It also provides functionality for adding decorators to existing classes or modules.