Generalize max(seq) and min(seq) to work with iterators.
NEEDS DOC CHANGES.
diff --git a/Lib/test/test_iter.py b/Lib/test/test_iter.py
index 952ab66..64fc01e 100644
--- a/Lib/test/test_iter.py
+++ b/Lib/test/test_iter.py
@@ -319,4 +319,39 @@
self.assertEqual(filter(lambda x: not x, seq), [False]*25)
self.assertEqual(filter(lambda x: not x, iter(seq)), [False]*25)
+ # Test max() and min()'s use of iterators.
+ def test_builtin_max_min(self):
+ self.assertEqual(max(SequenceClass(5)), 4)
+ self.assertEqual(min(SequenceClass(5)), 0)
+ self.assertEqual(max(8, -1), 8)
+ self.assertEqual(min(8, -1), -1)
+
+ d = {"one": 1, "two": 2, "three": 3}
+ self.assertEqual(max(d), "two")
+ self.assertEqual(min(d), "one")
+ self.assertEqual(max(d.itervalues()), 3)
+ self.assertEqual(min(iter(d.itervalues())), 1)
+
+ self.assertRaises(TypeError, list, list)
+ self.assertRaises(TypeError, list, 42)
+
+ f = open(TESTFN, "w")
+ try:
+ f.write("medium line\n")
+ f.write("xtra large line\n")
+ f.write("itty-bitty line\n")
+ finally:
+ f.close()
+ f = open(TESTFN, "r")
+ try:
+ self.assertEqual(min(f), "itty-bitty line\n")
+ f.seek(0, 0)
+ self.assertEqual(max(f), "xtra large line\n")
+ finally:
+ f.close()
+ try:
+ unlink(TESTFN)
+ except OSError:
+ pass
+
run_unittest(TestCase)