[IronPython] Weird Anomoly with SetStandardOutput

Michael Foord fuzzyman at voidspace.org.uk
Mon Apr 2 23:54:34 CEST 2007


Michael Foord wrote:
> Hello all,
>
> If I create a subclass of 'Stream' from IronPython - and set it onto a 
> PythonEngine using 'SetStandardOutput', then it fails with the following 
> message:
>
> Traceback (most recent call last):
>   File C:\Python Projects\modules in 
> progress\ironpython\embeddingDivert.py, lin
> e 32, in Initialize
>   File , line 0, in SetStandardOutput##94
> TypeError: issubclass: arg 1 must be a class
>
> If I define an empty class, and set this then I get the expected error 
> 'AttributeError: 'Diverter' object has no attribute 'get_CanSeek'.
>
> [snip...]
>
> Unfortunately this problem is going to block us very rapidly at 
> resolver. We can probably get round it by creating the stream subclass 
> in C# - but what is the problem with doing it from IronPython ?
>
>   

Except that I realise that you may not have anticipated your users 
passing .NET subclasses from one IronPython engine to another...

Can this be fixed ?

Michael




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