From db0d8a5b2c803d30d9df436e00b6627ec8e09a13 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Thu, 12 Sep 2019 03:52:49 -0700
Subject: [PATCH] bpo-37972: unittest.mock._Call now passes on __getitem__ to
 the __getattr__ chaining so that call() can be subscriptable (GH-15565)
 (GH-15965)
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* bpo-37972: unittest.mock._Call now passes on __getitem__ to the __getattr__ chaining so that call() can be subscriptable

* 📜🤖 Added by blurb_it.

* Update 2019-08-28-21-40-12.bpo-37972.kP-n4L.rst

added name of the contributor

* bpo-37972: made all dunder methods chainable for _Call

* bpo-37972: delegate only attributes of tuple instead to __getattr__
(cherry picked from commit 72c359912d36705a94fca8b63d80451905a14ae4)

Co-authored-by: blhsing <github@ydooby.com>
---
 Lib/unittest/mock.py                          |  6 ++++++
 Lib/unittest/test/testmock/testhelpers.py     | 20 +++++++++++++++++++
 .../2019-08-28-21-40-12.bpo-37972.kP-n4L.rst  |  5 +++++
 3 files changed, 31 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Library/2019-08-28-21-40-12.bpo-37972.kP-n4L.rst

diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index 7bfbfc92eef..cbc4d76b851 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -2464,6 +2464,12 @@ class _Call(tuple):
         return _Call(name=name, parent=self, from_kall=False)
 
 
+    def __getattribute__(self, attr):
+        if attr in tuple.__dict__:
+            raise AttributeError
+        return tuple.__getattribute__(self, attr)
+
+
     def count(self, /, *args, **kwargs):
         return self.__getattr__('count')(*args, **kwargs)
 
diff --git a/Lib/unittest/test/testmock/testhelpers.py b/Lib/unittest/test/testmock/testhelpers.py
index 301bca430c1..f3c7acb98c2 100644
--- a/Lib/unittest/test/testmock/testhelpers.py
+++ b/Lib/unittest/test/testmock/testhelpers.py
@@ -334,6 +334,26 @@ class CallTest(unittest.TestCase):
         self.assertEqual(_Call((('bar', 'barz'),),)[0], '')
         self.assertEqual(_Call((('bar', 'barz'), {'hello': 'world'}),)[0], '')
 
+    def test_dunder_call(self):
+        m = MagicMock()
+        m().foo()['bar']()
+        self.assertEqual(
+            m.mock_calls,
+            [call(), call().foo(), call().foo().__getitem__('bar'), call().foo().__getitem__()()]
+        )
+        m = MagicMock()
+        m().foo()['bar'] = 1
+        self.assertEqual(
+            m.mock_calls,
+            [call(), call().foo(), call().foo().__setitem__('bar', 1)]
+        )
+        m = MagicMock()
+        iter(m().foo())
+        self.assertEqual(
+            m.mock_calls,
+            [call(), call().foo(), call().foo().__iter__()]
+        )
+
 
 class SpecSignatureTest(unittest.TestCase):
 
diff --git a/Misc/NEWS.d/next/Library/2019-08-28-21-40-12.bpo-37972.kP-n4L.rst b/Misc/NEWS.d/next/Library/2019-08-28-21-40-12.bpo-37972.kP-n4L.rst
new file mode 100644
index 00000000000..73d9ef77762
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-08-28-21-40-12.bpo-37972.kP-n4L.rst
@@ -0,0 +1,5 @@
+Subscripts to the `unittest.mock.call` objects now receive the same chaining mechanism as any other custom attributes, so that the following usage no longer raises a `TypeError`:
+
+    call().foo().__getitem__('bar')
+
+Patch by blhsing