bpo-42406: Fix whichmodule() with multiprocessing (GH-23403)
* bpo-42406: Fix whichmodule() with multiprocessing
Signed-off-by: Renato L. de F. Cunha <renatoc@br.ibm.com>
Co-authored-by: Gregory P. Smith <greg@krypto.org>
(cherry picked from commit 86684319d3dad8e1a7b0559727a48e0bc50afb01)
Co-authored-by: Renato Cunha <renatocunha@acm.org>
diff --git a/Lib/pickle.py b/Lib/pickle.py
index cbac5f1..e63a8b6 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -340,7 +340,9 @@
# Protect the iteration by using a list copy of sys.modules against dynamic
# modules that trigger imports of other modules upon calls to getattr.
for module_name, module in sys.modules.copy().items():
- if module_name == '__main__' or module is None:
+ if (module_name == '__main__'
+ or module_name == '__mp_main__' # bpo-42406
+ or module is None):
continue
try:
if _getattribute(module, name)[0] is obj: