in news:49edb414$1@news.povray.org John VanSickle wrote:

> Pardon me if this has already been suggested.
> 
> Most macro writers could make the idiot-proofing of their macros much
> more thorough by having a feature by which it is possible to test an 
> argument passed to the macro to determine if it is of the expected
> type. 


http://docs.python.org/tutorial/errors.html#handling-exceptions

Ingo

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