Class variable inheritance
Steven D'Aprano
steven at REMOVE.THIS.cybersource.com.au
Tue Sep 8 18:53:38 EDT 2009
On Tue, 08 Sep 2009 04:36:19 -0700, HPJ wrote:
>> Makes sense to me. To step through what's happening:
>>
>> >>> A.n, B.n
>> (0, 0)
>>
>> Here, the lookup on B.n fails (that is, B itself has no variable n),
>> and thus falls back to A.n
>
> See, this is what tripped me up, right at the beginning. I thought B
> would inherit (as in copy) the variable n from A.
Inherit does not mean copy. What makes you think it does? Given the
following:
class A(object):
def foo(self):
return "foo"
class B(A):
pass
would you expect the B class to have a copy of the foo method?
--
Steven
More information about the Python-list
mailing list