[IronPython] Improvements to the hosting APIs

[Dino Viehland]

Jeff wrote:
> Hi all,
> Dave F. mentioned on Twitter that he was looking at the hosting APIs,
> and the made the mistake of accepting my unsolicited advice. So, here
> are a couple of my wishes (both form NWSGI):
> 
> * A version of PythonOps.MakeException that doesn't take a code
> context - It's not hard to create one, but every time I do I feel like
> I'm doing something wrong.
> * An easy way to wrap a Stream as a PythonFile.

I'm guessing you also want the Stream->PythonFile to not take a CodeContext? 

Do you think an extension method on Stream would be nice - such as
stream.ToPythonFile(string filename, string mode)?
 
> 
> I don't know where these make the most sense, but engine.MakeException
> and engine.MakeFile both seem right to me.
> 
> Other than that, the hosting APIs are very nice to use. I'm really
> reaching to come up with those issues.
> 
> - Jeff
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