From 363052adfc672a3af81721ac34c44ca0f4744445 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <raymond.hettinger@gmail.com>
Date: Wed, 3 Feb 2021 22:57:54 -0800
Subject: [PATCH 1/2] bpo-43102:  Set namedtuple __new__'s internal builtins to
 a dict.

---
 Lib/collections/__init__.py                                 | 2 +-
 Lib/test/test_collections.py                                | 6 ++++++
 .../next/Library/2021-02-03-22-55-27.bpo-43102.TSlZ6J.rst   | 2 ++
 3 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2021-02-03-22-55-27.bpo-43102.TSlZ6J.rst

diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
index 7d338131d6740d7..6fe3c4c5aa541d7 100644
--- a/Lib/collections/__init__.py
+++ b/Lib/collections/__init__.py
@@ -407,7 +407,7 @@ def namedtuple(typename, field_names, *, rename=False, defaults=None, module=Non
 
     namespace = {
         '_tuple_new': tuple_new,
-        '__builtins__': None,
+        '__builtins__': {},
         '__name__': f'namedtuple_{typename}',
     }
     code = f'lambda _cls, {arg_list}: _tuple_new(_cls, ({arg_list}))'
diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index a1ca958257adf6a..7a6b71a05fe3f5f 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -681,6 +681,12 @@ class NewPoint(tuple):
         self.assertEqual(np.x, 1)
         self.assertEqual(np.y, 2)
 
+    def test_new_builtins_issue_43102(self):
+        self.assertEqual(
+            namedtuple('C', ()).__new__.__globals__['__builtins__'],
+            {})
+
+
 
 ################################################################################
 ### Abstract Base Classes
diff --git a/Misc/NEWS.d/next/Library/2021-02-03-22-55-27.bpo-43102.TSlZ6J.rst b/Misc/NEWS.d/next/Library/2021-02-03-22-55-27.bpo-43102.TSlZ6J.rst
new file mode 100644
index 000000000000000..7319a0272cdd6b5
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2021-02-03-22-55-27.bpo-43102.TSlZ6J.rst
@@ -0,0 +1,2 @@
+The namedtuple __new__ method now had its __builtins__ set to None instead
+of an actual dictionary.  This created problems for introspection tools.

From 940a58142f7d44d70284642b44f17072b60ec1c2 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <raymond.hettinger@gmail.com>
Date: Wed, 3 Feb 2021 23:01:47 -0800
Subject: [PATCH 2/2] Fix typo

---
 Lib/test/test_collections.py                                    | 1 -
 .../next/Library/2021-02-03-22-55-27.bpo-43102.TSlZ6J.rst       | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index 7a6b71a05fe3f5f..befb7ab436c40af 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -687,7 +687,6 @@ def test_new_builtins_issue_43102(self):
             {})
 
 
-
 ################################################################################
 ### Abstract Base Classes
 ################################################################################
diff --git a/Misc/NEWS.d/next/Library/2021-02-03-22-55-27.bpo-43102.TSlZ6J.rst b/Misc/NEWS.d/next/Library/2021-02-03-22-55-27.bpo-43102.TSlZ6J.rst
index 7319a0272cdd6b5..985fd68a03a935d 100644
--- a/Misc/NEWS.d/next/Library/2021-02-03-22-55-27.bpo-43102.TSlZ6J.rst
+++ b/Misc/NEWS.d/next/Library/2021-02-03-22-55-27.bpo-43102.TSlZ6J.rst
@@ -1,2 +1,2 @@
-The namedtuple __new__ method now had its __builtins__ set to None instead
+The namedtuple __new__ method had its __builtins__ set to None instead
 of an actual dictionary.  This created problems for introspection tools.