#9351: set_defaults on subparser is no longer ignored if set on parent.
Before, if a default was set on the parent parser, any default for that
variable set via set_defaults on a subparser would be ignored. Now
the subparser set_defaults is honored.
Patch by Jyrki Pullianinen.
diff --git a/Lib/argparse.py b/Lib/argparse.py
index b5bb19a..1b233b8 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1089,7 +1089,14 @@
# parse all the remaining options into the namespace
# store any unrecognized options on the object, so that the top
# level parser can decide what to do with them
- namespace, arg_strings = parser.parse_known_args(arg_strings, namespace)
+
+ # In case this subparser defines new defaults, we parse them
+ # in a new namespace object and then update the original
+ # namespace for the relevant parts.
+ subnamespace, arg_strings = parser.parse_known_args(arg_strings, None)
+ for key, value in vars(subnamespace).items():
+ setattr(namespace, key, value)
+
if arg_strings:
vars(namespace).setdefault(_UNRECOGNIZED_ARGS_ATTR, [])
getattr(namespace, _UNRECOGNIZED_ARGS_ATTR).extend(arg_strings)