Extension without sub-classing?

Ben Finney bignose-hates-spam at and-zip-does-too.com.au
Tue Jun 3 04:55:11 CEST 2003


On Tue, 03 Jun 2003 02:17:35 GMT, Martin d'Anjou wrote:
> Is it possible to extend a python class without sub-classing?

AFAIK, no.

Why do you want to?  I can't see that it buys you anything, and it
causes all kinds of confusion when trying to use a class spread across
multiple files.

What is it you don't like about subclassing to extend functionality?


class car:
    def start_engine( self ):
        print "Engine started"

class car_with_brakes( car ):
    def apply_brakes( self ):
        print "Car stopped"

>>> vehicle = car_with_brakes()
>>> vehicle.start_engine()
Engine started
>>> vehicle.apply_brakes()
Car stopped
>>>

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