commit 476c294f260ebe1b44157a168c3dfa4a43724ce3
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Thu Oct 04 12:26:33 2018 -0700
committer Yury Selivanov <yury@magic.io> Thu Oct 04 15:26:33 2018 -0400
tree 11907dedad55a1384f6558770c91af4c026d6c3e
parent a67bd53d3f80ac9c518b5426aa35459bd373b2b3

bpo-34871: inspect: Don't pollute sys.modules (GH-9696) (#9701)

https://bugs.python.org/issue34871
(cherry picked from commit 6f85b826b527e240551613aeec3118a5469e3a33)

Co-authored-by: INADA Naoki <methane@users.noreply.github.com>

Lib/inspect.py

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 4482b8e..b5d583c 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1988,7 +1988,7 @@
         module = sys.modules.get(module_name, None)
         if module:
             module_dict = module.__dict__
-    sys_module_dict = sys.modules
+    sys_module_dict = sys.modules.copy()
 
     def parse_name(node):
         assert isinstance(node, ast.arg)