Re: Inheritance Question


Jackson wrote:
I've got an inheritance question and was hoping brighter minds could
guide me. I am in the strange situation where some of the methods in a
subclass are actually more general than methods in a superclass. What
is the preferred way to handle such situations. My original thought was
to do something like this:

class AA(object):
def general_method(): pass

class A(AA):
# redefine general_method() to call a
# restricted version of AA.general_method()

class B(A,AA):
# redefine general_method() to call AA.general_method()

This seems ugly to me, and I am wondering if there is a better method.
So any suggestions would be appreciated.


I don't have an answer, but I have a similar question, so I hope you
don't mind if I add it to this thread. Hopefully there will be some
commonality in the responses.

Continuing your analogy of animals, assume a class A with a 'walk'
method and an 'eat' method.

Most animals walk the same way, but a few don't, so I create a subclass
AW and override the walk method.

Most animals eat the same way, but a few don't, so I create a subclass
AE and override the eat method.

How do I create an instance of an animal that both walks and eats
differently?

This is how I do it at present.

class A(object): # walks normally, eats normally
def walk(self):
normal walk
def eat(self):
normal eat

class AW(A): # walks differently, eats normally
def walk(self):
different walk

class E(object): # abstract class
def eat(self):
different eat

class AE(E,A): # walks normally, eats differently
pass

class AWE(E,AW): # walks differently, eats differently
pass

So I use multiple inheritance instead of subclassing to override the
eat method. It works, but it feels ugly. Is there a cleaner solution?

Thanks

Frank Millman

.

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