Question

Possible Duplicate:
Python dynamic inheritance: How to choose base class upon instance creation?

I want a class to choose a base class on the fly based on a parameter in the init method.

Class A():
    #...
Class B():
    #...
Class C():
    def __init__(self, base_type):
        if parent_type == 'A':
            #TODO: make C derive A
        else:
            #TODO: make C derive B

A and B are library classes that derive the same base class.

The answers to a similar question seemed too ugly.

Answer 1

I assume you mean base_type insteand of parent type. But the following should work

Class C():
    def __init__(self, base_type):
        if base_type == 'A':
            self.__class__=A
        else:
            self.__class__=B

Some more details on this approach can be found here: http://harkablog.com/dynamic-state-machines.html