Message221159
If I understand it right, in a simple case like this:
class Foo(object):
def __setattr__(self, name, value):
# some logic, then...
super(Foo, self).__setattr__(name, value)
calling super is equivalent to calling object.__setattr__, but doesn't have any added-value since there's no cooperative multiple inheritance involved, in that case we are better off calling the parent class method directly.
If Foo evolves to have multiple ancestors, object has a __setattr__ method and that object is always the last class in the MRO chain, so any sequence of calls to super(..).__setattr__ is guaranteed to end with a call to object.__setattr__ method (assuming ancestors __setattr__ method, if any, calls super as well), and that may be what we want, i.e. to also benefit from an ancestor __setattr__ method.
Hmm, this last point may be too specific if not out of scope in regards to the documentation. Falling back to the original need, from the documentation "If __setattr__() wants to assign to an instance attribute...", so as you said, "calling object.__setattr__ gives a known, guaranteed behavior". |
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Date |
User |
Action |
Args |
2014-06-21 07:41:06 | b9 | set | recipients:
+ b9, rhettinger, docs@python |
2014-06-21 07:41:06 | b9 | set | messageid: <1403336466.2.0.207375320833.issue21814@psf.upfronthosting.co.za> |
2014-06-21 07:41:06 | b9 | link | issue21814 messages |
2014-06-21 07:41:05 | b9 | create | |
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