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Using Mix-ins with Python

Issue 84

From Issue #84
April 2001

Apr 01, 2001  By Chuck Esterbrook
 in
An explanation of the mix-in programming style as applied in Python.
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Just can't stand seeing this

Grubert's picture
Submitted by Grubert (not verified) on Mon, 10/11/2010 - 15:42.

Just can't stand seeing this Mixin() function. It's a prime example of pointless code; all it does is call a function on the object passed in.

"In case we want to add to it.." and what might you add to such a generic operation?

If you're going to write that kind of thing, use Java. Those guys expect it.

And mixins make more sense in a language like Java, where interface implementations must be complete. Python's duck typing means you only need as much implementation as you need, and on top of that there's no reason to not just make a runtime object with the necessary method rather then adding methods to an existing object.

Much abo about very little.

"Python supports dynamic changes to the class hierarchy."

Donny Viszneki's picture
Submitted by Donny Viszneki (not verified) on Tue, 03/24/2009 - 10:33.

CPython supports this, but that isn't necessarily the same as saying Python supports this. You can't just set some __class__ member variable in Jython or IronPython, for example. Tinypy also supports this sort of thing, but with more Lua-esque "metatables."

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