Tweak recipes and tests
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst
index 9ed0c54..f546fe1 100644
--- a/Doc/library/itertools.rst
+++ b/Doc/library/itertools.rst
@@ -662,15 +662,15 @@
def pairwise(iterable):
"s -> (s0,s1), (s1,s2), (s2, s3), ..."
a, b = tee(iterable)
- try:
- b.next()
- except StopIteration:
- pass
+ for elem in b:
+ break
return izip(a, b)
- def grouper(n, iterable, padvalue=None):
+ def grouper(n, iterable, fillvalue=None):
"grouper(3, 'abcdefg', 'x') --> ('a','b','c'), ('d','e','f'), ('g','x','x')"
- return izip(*[chain(iterable, repeat(padvalue, n-1))]*n)
+ args = [iter(iterable)] * n
+ kwds = dict(fillvalue=fillvalue)
+ return izip_longest(*args, **kwds)
def roundrobin(*iterables):
"roundrobin('abc', 'd', 'ef') --> 'a', 'd', 'e', 'b', 'f', 'c'"