diff -r 64afd5cab40a -r 6cbd51376ecb Lib/unittest/mock.py
--- a/Lib/unittest/mock.py	Tue Dec 13 19:03:51 2016 -0500
+++ b/Lib/unittest/mock.py	Wed Dec 14 10:39:42 2016 +0800
@@ -1963,7 +1963,8 @@
     """
     def __new__(cls, value=(), name=None, parent=None, two=False,
                 from_kall=True):
-        name = ''
+        if name is None:
+            name = ''
         args = ()
         kwargs = {}
         _len = len(value)