Daniel Roy Greenfeld

Daniel Roy Greenfeld

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Inheritence is fun!

This was originally posted on blogger here.

Imagine this view in python:

class MyFirstForm(formbase.PageForm):
    # lots and lots of finicky code.

Now lets say we want to capture everything in that view, but give it a slightly different behavior. How about this?

class MySecondForm(formbase.SubPageForm,FeedbackForm): pass

So what does this do?

Well, in Python what this does is make the second class inherit the properties of a similar base class, then overwrite it with the properties of the first form. The order of precedence in inheritance in Python is very clear and straightforward. The result is a wonderful case of object oriented code reuse.

I believe Ruby does it in a very similar fashion.

Tags: ruby python java legacy-blogger
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