[Zope3-dev] Re: Traversal without hiding deep exceptions

[Jim Fulton]

Steve Alexander wrote:
...
> But, I think we need to do better than the Python behaviour for Zope 3. 
>  Zope 3 is all about integrating software in interesting and complex 
> ways.  To make the process of integration workable, we need to avoid 
> hiding such exceptions.
> 
> There is a way around this:  Some code in the interface package uses a 
> trick from Phillip Eby to see whether an exception was raised 
> "immediately" or "deeply" by examining the depth of the traceback.  I've 
> put this code into a function:
> 
>   import sys
> 
>   def deep_exception():
>       return sys.exc_info()[2].tb_next is not None

Cool.

Jim

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