[Tutor] intefaces in python

[Amit Sethi]

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 <andreengels at gmail.com>wrote:

> On Sun, Jun 28, 2009 at 5:00 PM, Amit Sethi<amit.pureenergy at gmail.com>
> 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, andreengels at gmail.com
>



-- 
A-M-I-T S|S
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