Copy reduce() to _functools so to have functools.reduce() not raise a warning
from usage under -3.
diff --git a/Lib/test/test_functools.py b/Lib/test/test_functools.py
index 6012f9f..30d419d 100644
--- a/Lib/test/test_functools.py
+++ b/Lib/test/test_functools.py
@@ -267,6 +267,48 @@
self.assertEqual(wrapper.dict_attr, f.dict_attr)
+class TestReduce(unittest.TestCase):
+
+ def test_reduce(self):
+ class Squares:
+
+ def __init__(self, max):
+ self.max = max
+ self.sofar = []
+
+ def __len__(self): return len(self.sofar)
+
+ def __getitem__(self, i):
+ if not 0 <= i < self.max: raise IndexError
+ n = len(self.sofar)
+ while n <= i:
+ self.sofar.append(n*n)
+ n += 1
+ return self.sofar[i]
+
+ reduce = functools.reduce
+ self.assertEqual(reduce(lambda x, y: x+y, ['a', 'b', 'c'], ''), 'abc')
+ self.assertEqual(
+ reduce(lambda x, y: x+y, [['a', 'c'], [], ['d', 'w']], []),
+ ['a','c','d','w']
+ )
+ self.assertEqual(reduce(lambda x, y: x*y, range(2,8), 1), 5040)
+ self.assertEqual(
+ reduce(lambda x, y: x*y, range(2,21), 1L),
+ 2432902008176640000L
+ )
+ self.assertEqual(reduce(lambda x, y: x+y, Squares(10)), 285)
+ self.assertEqual(reduce(lambda x, y: x+y, Squares(10), 0), 285)
+ self.assertEqual(reduce(lambda x, y: x+y, Squares(0), 0), 0)
+ self.assertRaises(TypeError, reduce)
+ self.assertRaises(TypeError, reduce, 42, 42)
+ self.assertRaises(TypeError, reduce, 42, 42, 42)
+ self.assertEqual(reduce(42, "1"), "1") # func is never called with one item
+ self.assertEqual(reduce(42, "", "1"), "1") # func is never called with one item
+ self.assertRaises(TypeError, reduce, 42, (42, 42))
+
+
+
def test_main(verbose=None):
import sys
@@ -275,7 +317,8 @@
TestPartialSubclass,
TestPythonPartial,
TestUpdateWrapper,
- TestWraps
+ TestWraps,
+ TestReduce,
)
test_support.run_unittest(*test_classes)