[IronPython] Determine the classes/interfaces a Python implements

[Curt Hagenlocher]

(Dino clearly meant this to be a reply to the other thread with respect to C
file descriptors. :)

On Mon, Dec 15, 2008 at 1:24 PM, Dino Viehland <dinov at microsoft.com> wrote:

> Can you open a feature request on CodePlex?  It's certainly an interesting
> idea to ponder and I'm leaning towards it but there's lots of details to be
> gotten right.
>
> Do you know if this needs to work w/ sockets as well?  (There's also the
> question of can we make it work with sockets?  :))
>
> There'll be a bunch of places we need to update (nt, socket, file, select,
> etc...) so I think it'll have to wait until 2.1 instead of coming in a minor
> update like 2.0.1.
>
> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:
> users-bounces at lists.ironpython.com] On Behalf Of Michael Foord
> Sent: Monday, December 15, 2008 1:20 PM
> To: Discussion of IronPython
>  Subject: Re: [IronPython] Determine the classes/interfaces a Python
> implements
>
>
> Hi Jeff,
>
> Probably the easiest way of doing this is to define a Python function
> that uses issubtype. You can use this as a delegate from the C# side
> (warning untested):
>
> ScriptScope scope = engine.CreateScope();
> ScriptSource imports = engine.CreateScriptSourceFromString("from System
> import ISomething", SourceCodeKind.Staatements);
> imports.Execute(scope);
> ScriptSource source = engine.CreateScriptSourceFromString("lambda x:
> issubtype(x, ISomething)", SourceCodeKind.Expression);
> Func<object, bool> Implements = (scope)source.Execute(scope);
>
> bool result = Implements(some_object);
>
>
> Note that issubtype will barf if you give it anything other than a type,
> so it may make more sense to define a function with exception handling
> and pull it out of the scope instead.
>
> HTH
>
> Michael Foord
>
>
> Jeff Slutter wrote:
> > I have a Python script that creates a class within it. This Python class
> > is derived off of a class, or interface, I made in C# - something like:
> >
> > class MyClass(Test.MainForm.IScript):
> >     ...
> >
> > Now, back in C#, I have gotten access to "MyClass" by:
> >
> > object myclass = someScope.GetVariable("MyClass");
> >
> > Is there a way to determine either:
> > a) what classes/interfaces MyClass implements OR
> > b) if it implements a specific class/interface
> >
> > I want to know if the "object myclass" is supposed to implement
> > Test.MainForm.IScript or not.
> >
> > I don't want to create an instance of MyClass as this would cause
> > problems, executing things I'm not ready to execute.
> >
> > Also, related but not as important, implementing an interface (as above)
> > doesn't cause any compiler errors if I'm missing functions - is there a
> > way to enforce this?
> >
> >
> > Thanks,
> > Jeff
> > _______________________________________________
> > Users mailing list
> > Users at lists.ironpython.com
> > http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
> >
>
>
> --
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>
>
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