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Showing content from https://mail.python.org/pipermail/python-dev/2002-July/027032.html below:

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

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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).

	Oren

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