[IronPython] IronPython and polymorphism? Help with interfaces

Miha Valencic miha.valencic at gmail.com
Wed Jan 23 22:06:45 CET 2008


thanks for the informative answer with samples. I agree with what you write,
but that was not what I had in mind. Consider this c# code:

IPerson foo = new Person();
foo.Name; // works in c#, because foo is of type IPerson.

in ipy, I can not explicitly define an Interface type like
foo = IPerson(Person())

And even if I pass the IPerson to ipy, ipy will "see" the first
implementation, not the type I am passing. So, If I have something like

locals["foo"] = foo;, where foo is defined as:

IFoo1 foo = new Foo() as IFoo1;

Foo: BaseFoo, IFoo1, IFoo2

and BaseFoo is defined as

BaseFoo : IFoo1, IFoo2

and IFoo1 { string Name {get;set;}}

then Python will "see" the object passed in as BaseFoo, as this is the only
implementation (although we want to pass in the "contract", interface

I know it looks complicated... In short:
If I pass ISomething to c#, I can call it. If I pass ISomething to ipy, it
"knows better" and treats it as BaseSomething or whatever the first class
is. ;)
Maybe a strong-typed method of passing in the locals/globals would help.
Something like anonymous types, perhaps?

IMyInteface myInterface = ....
engine.Execute("print foo.Name", eng.CreateModule(), new { foo = myInterface


On Jan 23, 2008 9:35 PM, Dino Viehland <dinov at exchange.microsoft.com> wrote:

>  I agree, we should document it, unfortunately our documentation is still
> woefully inadequate  L.
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