itertools: Add starmap function

itertools/itertools.py

@@ -51,3 +51,7 @@ def islice(p, start, stop=(), step=1):
 
 def tee(iterable, n=2):
     return [iter(iterable)] * n
+
+def starmap(function, iterable):
+    for args in iterable:
+        yield function(*args)

itertools/test_itertools.py

@@ -12,3 +12,5 @@ assert list(itertools.islice(g(), 5)) == [123, 123, 123, 123, 123]
 
 assert list(itertools.islice(itertools.cycle([1, 2, 3]), 10)) == [1, 2, 3, 1, 2, 3, 1, 2, 3, 1]
 assert list(itertools.islice(itertools.cycle(reversed([1, 2, 3])), 7)) == [3, 2, 1, 3, 2, 1, 3]
+
+assert list(itertools.starmap(lambda x, y: x * y, [[1, 2], [2, 3], [3, 4]])) == [2, 6, 12]