From f5ab339a559a3771bb9293b0bdd0c8d987091888 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Mon, 20 Oct 2003 20:45:33 +0000
Subject: Backport 1.19:

   Use 'predicate = bool' as the default predicate for ifilter[false].
---
 Doc/lib/libitertools.tex | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/Doc/lib/libitertools.tex b/Doc/lib/libitertools.tex
index dc1a77c..596406f 100644
--- a/Doc/lib/libitertools.tex
+++ b/Doc/lib/libitertools.tex
@@ -140,8 +140,7 @@ by functions or loops that truncate the stream.
   \begin{verbatim}
      def ifilter(predicate, iterable):
          if predicate is None:
-             def predicate(x):
-                 return x
+             predicate = bool
          for x in iterable:
              if predicate(x):
                  yield x
@@ -157,8 +156,7 @@ by functions or loops that truncate the stream.
   \begin{verbatim}
      def ifilterfalse(predicate, iterable):
          if predicate is None:
-             def predicate(x):
-                 return x
+             predicate = bool
          for x in iterable:
              if not predicate(x):
                  yield x
-- 
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