Replace the window() example with pairwise() which demonstrates tee().

1 files changed, 4 insertions, 10 deletions

diff --git a/Doc/lib/libitertools.tex b/Doc/lib/libitertools.tex
index eb6bc49..27e4e45 100644
--- a/Doc/lib/libitertools.tex
+++ b/Doc/lib/libitertools.tex
@@ -405,15 +405,9 @@ def repeatfunc(func, times=None, *args):
     else:
         return starmap(func, repeat(args, times))
 
-def window(seq, n=2):
-    "Returns a sliding window (of width n) over data from the iterable"
-    "   s -> (s0,s1,...s[n-1]), (s1,s2,...,sn), ...                   "
-    it = iter(seq)
-    result = tuple(islice(it, n))
-    if len(result) == n:
-        yield result    
-    for elem in it:
-        result = result[1:] + (elem,)
-        yield result
+def pairwise(iterable):
+    "s -> (s0,s1), (s1,s2), (s2, s3), ..."
+    a, b = tee(iterable)
+    return izip(a, islice(b, 1, None))
 
 \end{verbatim}