commit c71ae1a45bd6e6d0f5aebc470b35f5a7dc0d8078
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Thu Aug 29 02:02:51 2019 -0700
committer Raymond Hettinger <rhettinger@users.noreply.github.com> Thu Aug 29 02:02:51 2019 -0700
tree 1e89af5c38142e19f260f1490423baa9ecf1f32e
parent 0d45d50e421b46b56195821580c3760b43813106

bpo-36743: __get__ is sometimes called without the owner argument (GH-12992) (GH-15589)

(cherry picked from commit 0dac68f1e593c11612ed54af9edb865d398f3b05)

Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>

Lib/unittest/mock.py

diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index 7ab6812..4c76f53 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -2806,7 +2806,7 @@
     def _get_child_mock(self, /, **kwargs):
         return MagicMock(**kwargs)
 
-    def __get__(self, obj, obj_type):
+    def __get__(self, obj, obj_type=None):
         return self()
     def __set__(self, obj, val):
         self(val)