Hello Dino,
The original question was about '__call__'. As far as I can *tell* that
doesn't work either:
namespace example
{
public class Example
{
public int __call__(string key)
{
Console.WriteLine(key);
return 3;
}
}
}
>>> clr.AddReference('example')
>>> from example import Example
>>>
>>> e = Example()
>>> e('r')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Example is not callable
>>> e.__call__('r')
r
3
>>>
Michael
Dino Viehland wrote:
Srivatsn's blog is an important piece of the puzzle, but the more general
answer is implementing the __*__ method directly should always work. If it
doesn't then it's a bug - like where __repr__ wasn't working w/o implementing
the interface until recently.
But there is a good reason to not implement the __*__ method - and that's
ensuring that your objects will work good in a multi-language environment.
What IronPython does to expose .NET objects into Python is it maps a large
number of .NET interfaces and methods into Python methods. If you'd like to
see the all of the mappings they're contained entirely in TypeInfo.cs. So
instead of implementing __getitem__ you can implement a C# indexer, instead of
__enter__/__exit__ you can implement IDisposable - assuming you're not doing
more interesting things w/ __enter__/__exit__, etc... If there's some mapping
that you think should exist but we don't have let us know - for example until
recently we had overlooked mapping IDisposable.
To get the best interop if there's a .NET interface or operator method that
maps onto the Python methods you should use that. That includes the extended
operators that we've defined for the DLR default binder like GetCustomMember as
Srivatsn's blog demonstrates. Otherwise fallback to the __*_- method.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Michael Foord
Sent: Sunday, July 13, 2008 10:21 AM
To: Discussion of IronPython
Subject: Re: [IronPython] Using Python special methods in C#
Dan Eloff wrote:
Something I've found a little difficult in C# is python special
methods. It seems sometimes you can just declare them on the C# class,
(__repr__?) and they will work, other times you need to implement an
interface (__call__?) is there any place this is documented?
I'm a little confused about how to add special methods on C# classes.
I want to add __getattr__ to a C# class (actually a subclass of
PythonDictionary), and I have no idea how.
This example from Srivatsn shows you how:
http://blogs.msdn.com/srivatsn/archive/2008/04/12/turning-your-net-object-models-dynamic-for-ironpython.aspx
Michael
Thanks,
-Dan
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