bpo-43102: Set namedtuple __new__'s internal builtins to a dict. (GH-24439)
diff --git a/Lib/collections/__init__.py b/Lib/collections/__init__.py
index 7d33813..6fe3c4c 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 a1ca958..befb7ab 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -681,6 +681,11 @@ 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 0000000..985fd68
--- /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 had its __builtins__ set to None instead
+of an actual dictionary. This created problems for introspection tools.