From: Fred Drake <fdrake@acm.org>
Date: Wed, 12 Dec 2001 06:06:43 +0000 (+0000)
Subject: Add a note about yield requiring a __future__ directive.
X-Git-Tag: v2.2.1c1~410
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8d0645cb84c3a8babce4b9b44c389e175e293b2a;p=python

Add a note about yield requiring a __future__ directive.
---

diff --git a/Doc/ref/ref6.tex b/Doc/ref/ref6.tex
index 1f1486bac7..3089b1af38 100644
--- a/Doc/ref/ref6.tex
+++ b/Doc/ref/ref6.tex
@@ -482,6 +482,16 @@ 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.
 
+\note{In Python 2.2, the \keyword{yield} statement is only allowed
+when the \code{generators} feature has been enabled.  It will always
+be enabled in Python 2.3.  This \code{__future__} import statment can
+be used to enable the feature:}
+
+\begin{verbatim}
+from __future__ import generators
+\end{verbatim}
+
+
 \begin{seealso}
   \seepep{0255}{Simple Generators}
          {The proposal for adding generators and the \keyword{yield}