Ricardo Kirkner wrote:
I have a TestCase class, which inherits from both Django's TestCase
and from some custom TestCases that act as mixin classes. So I have
something like
class MyTestCase(TestCase, Mixin1, Mixin2):
...
now django's TestCase class inherits from unittest2.TestCase, which we
found was not calling super. Even if this is a bug and should be fixed
in unittest2, this is an example where I, as a consumer of django,
shouldn't have to be worried about how django's TestCase class is
implemented. Since I explicitely base off 3 classes, I expected all 3
classes to be initialized, and I expect the setUp method to be called
on all of them.
If I'm assuming/expecting unreasonable things, please enlighten me.
If we treat django's failure to use super as a bug, you want the Python
language to work-around that bug so that:
"I, as a consumer of django, shouldn't have to be worried about bugs in
django". (For at least one class of bug.)
If we *don't* treat django's failure to use super as a bug, but as a
deliberate design choice, then you are trying to do something which
django doesn't support. Possibly *deliberately* doesn't support. You
want the Python language to add that support so that:
"I, as a consumer of django, shouldn't have to be worried about whether
django supports what I want to do or not".
Either way you look at it, I think it's extremely unreasonable to expect
the language to work-around bugs in third-party applications, or to add
features to them that the third-party developers either didn't consider
or don't want.
Multiple inheritance is tricky enough to get right without adding "Do
What I Mean" black magic to it. I'd rather work around bugs in
third-party classes than try to deal with Python actively subverting the
code I read and write by mysteriously calling superclass methods where
there is no call to a superclass method.
--
Steven
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