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| -rw-r--r-- | Doc/ref/ref6.tex | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/Doc/ref/ref6.tex b/Doc/ref/ref6.tex index d1d23ac..1eb1258 100644 --- a/Doc/ref/ref6.tex +++ b/Doc/ref/ref6.tex @@ -488,11 +488,12 @@ enough information is saved so that the next time \method{next()} is invoked, the function can proceed exactly as if the \keyword{yield} statement were just another external call. -The \keyword{yield} statement is not allowed in the \keyword{try} -clause of a \keyword{try} ...\ \keyword{finally} construct. The -difficulty is that there's no guarantee the generator will ever be -resumed, hence no guarantee that the \keyword{finally} block will ever -get executed. +As of Python version 2.5, the \keyword{yield} statement is now +allowed in the \keyword{try} clause of a \keyword{try} ...\ +\keyword{finally} construct. If the generator is not resumed before +it is finalized (by reaching a zero reference count or by being garbage +collected), the generator-iterator's \method{close()} method will be +called, allowing any pending \keyword{finally} clauses to execute. \begin{notice} In Python 2.2, the \keyword{yield} statement is only allowed @@ -510,6 +511,11 @@ from __future__ import generators \seepep{0255}{Simple Generators} {The proposal for adding generators and the \keyword{yield} statement to Python.} + + \seepep{0342}{Coroutines via Enhanced Generators} + {The proposal that, among other generator enhancements, + proposed allowing \keyword{yield} to appear inside a + \keyword{try} ... \keyword{finally} block.} \end{seealso} |