SF patch #1171417: bug fix for islice() in docs

1 files changed, 7 insertions, 9 deletions

diff --git a/Doc/lib/libitertools.tex b/Doc/lib/libitertools.tex
index 780ed55..9d7f7ca 100644
--- a/Doc/lib/libitertools.tex
+++ b/Doc/lib/libitertools.tex
@@ -250,16 +250,14 @@ by functions or loops that truncate the stream.
   third line).  Equivalent to:
 
   \begin{verbatim}
-     def islice(iterable, *args):
+     def islice(iterable, *args):    
          s = slice(*args)
-         next, stop, step = s.start or 0, s.stop, s.step or 1
-         for cnt, element in enumerate(iterable):
-             if cnt < next:
-                 continue
-             if stop is not None and cnt >= stop:
-                 break
-             yield element
-             next += step             
+         it = iter(xrange(s.start or 0, s.stop or sys.maxint, s.step or 1))
+         nexti = it.next()
+         for i, element in enumerate(iterable):
+             if i == nexti:
+                 yield element
+                 nexti = it.next()          
   \end{verbatim}
 
   If \var{start} is \code{None}, then iteration starts at zero.