Peter
To my mind, this kind of setup (interface class, or abstact class) is more
usually used in static languages to benefit polymorphism - but python is
dynamically typed, so in which situations would this setup be useful in a
python program? You see, I expected your post to say that it wouldn't
even be necessary, but you didn't :)
I have spent a little effort training myself not to bother setting up
class hierarchies like this in python, due to the fact that I use Delphi a
lot at work (I do pretty much the code below to let myself know when an
inherited/abstract class method is being called in error).
regards
Caleb
On Mon, 01 Aug 2005 18:52:02 +0200, Peter Hansen <[EMAIL PROTECTED]> wrote:
> phil hunt wrote:
>> Suppose I'm writing an abstract superclass which will have some
>> concrete subclasses. I want to signal in my code that the subclasses
>> will implement certan methods. Is this a Pythonic way of doing what I
>> have in mind:
>> class Foo: # abstract superclass
>> def bar(self):
>> raise Exception, "Implemented by subclass"
>> def baz(self):
>> raise Exception, "Implemented by subclass"
>
> Change those to "raise NotImplementedError('blah')" instead and you'll
> be taking the more idiomatic approach.
>
> -Peter
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