Issue #18214: Improve finalization of Python modules to avoid setting their globals to None, in most cases.

Lib/test/final_b.py

@@ -0,0 +1,19 @@
+"""
+Fodder for module finalization tests in test_module.
+"""
+
+import shutil
+import test.final_a
+
+x = 'b'
+
+class C:
+    def __del__(self):
+        # Inspect module globals and builtins
+        print("x =", x)
+        print("final_a.x =", test.final_a.x)
+        print("shutil.rmtree =", getattr(shutil.rmtree, '__name__', None))
+        print("len =", getattr(len, '__name__', None))
+
+c = C()
+_underscored = C()