Neaten-up the itertools recipes.
diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py
index ee50e2a..8c482c5 100644
--- a/Lib/test/test_itertools.py
+++ b/Lib/test/test_itertools.py
@@ -1255,13 +1255,13 @@
... return zip(a, b)
>>> def grouper(n, iterable, fillvalue=None):
-... "grouper(3, 'abcdefg', 'x') --> ('a','b','c'), ('d','e','f'), ('g','x','x')"
+... "grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
... args = [iter(iterable)] * n
... kwds = dict(fillvalue=fillvalue)
... return zip_longest(*args, **kwds)
>>> def roundrobin(*iterables):
-... "roundrobin('abc', 'd', 'ef') --> 'a', 'd', 'e', 'b', 'f', 'c'"
+... "roundrobin('ABC', 'D', 'EF') --> A D E B F C"
... # Recipe credited to George Sakkis
... pending = len(iterables)
... nexts = cycle(iter(it).__next__ for it in iterables)
@@ -1281,10 +1281,8 @@
... yield set(x for m, x in pairs if m&n)
>>> def compress(data, selectors):
-... "compress('abcdef', [1,0,1,0,1,1]) --> a c e f"
-... decorated = zip(data, selectors)
-... filtered = filter(operator.itemgetter(1), decorated)
-... return map(operator.itemgetter(0), filtered)
+... "compress('ABCDEF', [1,0,1,0,1,1]) --> A C E F"
+... return (d for d, s in zip(data, selectors) if s)
>>> def combinations_with_replacement(iterable, r):
... "combinations_with_replacement('ABC', 3) --> AA AB AC BB BC CC"