class MyInterface(object):
doSomething(line):
raise NotImplementedError
doSomethingElse(line):
raise NotImplementedError
I think that is exactly the kind of structure i was looking for ...
On Mon, Jun 29, 2009 at 12:58 PM, Andre Engels <[email protected]>wrote:
> On Sun, Jun 28, 2009 at 5:00 PM, Amit Sethi<[email protected]>
> wrote:
> > Hi , I don't suppose python has a concept of interfaces. But can somebody
> > tell me if their is a way i can implement something like a java
> interface
> > in python.
>
> Sure. Interfaces are just Java's compensation for not having multiple
> inheritance. Python does have multiple inheritance, so that's what one
> would use. Although one could also use duck typing, and then use
> 'nothing' as an implementation...
>
> More specific:
>
> ========================
> Java Interface:
> public interface MyInterface {
> string doSomething(string line);
> string doSomethingElse(string line);
> }
>
> Java Implementation:
> public class MyImplementation {
> string doSomething(string line) {
> return "I did something with" + line;
> }
> string doSomethingElse(string line) {
> return "I did something else."
> }
> }
>
> ==============================
> Python Interface:
>
> class MyInterface(object):
> doSomething(line):
> raise NotImplementedError
> doSomethingElse(line):
> raise NotImplementedError
>
> Python Implementation:
> class MyImplementation(MyInterface):
> doSomething(line):
> return "I did something with "+line
> doSomethingElse(line):
> return "I did something else."
>
> ==============================
> Python interface using duck typing:
>
> # Hey guys, when you call something a 'MyInterface', it needs methods
> doSomething and doSomethingElse
>
> Python Implementation using duck typing:
>
> class MyImplementation(object):
> # These things implement MyInterface
> doSomething(line):
> return "I did something with "+line
> doSomethingElse(line):
> return "I did something else."
>
>
> --
> André Engels, [email protected]
>
--
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