As discussed on python-dev, changed builtin.zip() to handle zero arguments

by returning an empty list instead of raising a TypeError.

2 files changed, 6 insertions, 2 deletions

diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 3dd2ffc..65dabb1 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -1126,7 +1126,8 @@ class BuiltinTest(unittest.TestCase):
                 if i < 0 or i > 2: raise IndexError
                 return i + 4
         self.assertEqual(zip(a, I()), t)
-        self.assertRaises(TypeError, zip)
+        self.assertEqual(zip(), [])
+        self.assertEqual(zip(*[]), [])
         self.assertRaises(TypeError, zip, None)
         class G:
             pass
diff --git a/Lib/test/test_iter.py b/Lib/test/test_iter.py
index 383fce3..f83de78 100644
--- a/Lib/test/test_iter.py
+++ b/Lib/test/test_iter.py
@@ -423,7 +423,10 @@ class TestCase(unittest.TestCase):
 
     # Test zip()'s use of iterators.
     def test_builtin_zip(self):
-        self.assertRaises(TypeError, zip)
+        self.assertEqual(zip(), [])
+        self.assertEqual(zip(*[]), [])
+        self.assertEqual(zip(*[(1, 2), 'ab']), [(1, 'a'), (2, 'b')])
+
         self.assertRaises(TypeError, zip, None)
         self.assertRaises(TypeError, zip, range(10), 42)
         self.assertRaises(TypeError, zip, range(10), zip)