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Showing content from http://mail.python.org/pipermail/python-dev/2002-July/027035.html below:

[Python-Dev] patch: try/finally in generators

[Python-Dev] patch: try/finally in generators [Python-Dev] patch: try/finally in generatorsGuido van Rossum guido@python.org
Mon, 29 Jul 2002 13:34:01 -0400
> http://www.python.org/sf/584626
> 
> This patch removes the limitation of not allowing yield in the try part
> of a try/finally. The dealloc function of a generator checks if the 
> generator is still alive and resumes it one last time from the return 
> instruction at the end of the code, causing any try/finally blocks to be 
> triggered. Any exceptions raised are treated just like exceptions in a
> __del__ finalizer (printed and ignored).

I'm not sure I understand what it does.  The return instruction at the
end of the code, if I take this literally, isn't enclosed in any
try/finally blocks.  So how can this have the desired effect?

Have you verified that Jython can implement these semantics too?

Do you *really* need this?

--Guido van Rossum (home page: http://www.python.org/~guido/)



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