can I call operator overloader in superclass?

Jon J. Morin rotundo52 at hotmail.com
Thu Jun 20 07:17:00 CEST 2002


Erik Max Francis wrote:

> "Jon J. Morin" wrote:
> 
>> TypeError: repr not string
>> 
>> For one, I don't understand the error.  For seconds, can I call
>> __repr__ in
>> the superclass from __repr__ in the subclass?
> 
> I'm guessing you have an older version of Python.  In Python 2.2 this is
> the error you'll get:
> 
> TypeError: __repr__ returned non-string (type NoneType)
> 
> which I can only presume was changed to be a little more descriptive.
> The calling superclass methods in subclasses is actually leading you
> astray -- all the error is telling you is that your __repr__ method must
> return and yours isn't.  Change the __repr__ method in your subclass so
> that it returns a string and you're off and running.
> 
> To answer your other question (which really wasn't the issue here), you
> can certainly explicitly call a superclass method in a subclass, and
> you'd had the syntax right:  Specify the superclass method is an unbound
> method and then explicitly pass in the self object:
> 
> class Superclass:
> ...
> 
> def method(self):
> ...
> 
> class Subclass(Superclass):
> ...
> 
> def method(self):
> ...
> Superclass.method(self)
> ...
> 
> 
Thanks.  All I forgot was a return statement in the subclass method and it 
works now.  Thanks for the help.

Jon



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