Policy Based Design In Python

I was very impressed by the policy based design described in Modern C++ Design by Andrei Alexandrescu and tried it successfully in some light weight programs. Now I have to write a

Solution 1:

My aim is to develop an auctioning system and I want to be able to choose the auction strategy - English, Dutch, Silent, etc - at run time.

You could just use strategy pattern (also known as the policy pattern) to accomplish exactly this.

You could also use mixins to provide the strategy instead of composition.