1 files changed, 3 insertions, 17 deletions
diff --git a/Lib/argparse.py b/Lib/argparse.py
index f5a7342..d24fa72 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1709,14 +1709,7 @@ class _ArgumentGroup(_ActionsContainer):
         self._group_actions.remove(action)
 
     def add_argument_group(self, *args, **kwargs):
-        import warnings
-        warnings.warn(
-            "Nesting argument groups is deprecated.",
-            category=DeprecationWarning,
-            stacklevel=2
-        )
-        return super().add_argument_group(*args, **kwargs)
-
+        raise ValueError('argument groups cannot be nested')
 
 class _MutuallyExclusiveGroup(_ArgumentGroup):
 
@@ -1737,15 +1730,8 @@ class _MutuallyExclusiveGroup(_ArgumentGroup):
         self._container._remove_action(action)
         self._group_actions.remove(action)
 
-    def add_mutually_exclusive_group(self, *args, **kwargs):
-        import warnings
-        warnings.warn(
-            "Nesting mutually exclusive groups is deprecated.",
-            category=DeprecationWarning,
-            stacklevel=2
-        )
-        return super().add_mutually_exclusive_group(*args, **kwargs)
-
+    def add_mutually_exclusive_group(self, **kwargs):
+        raise ValueError('mutually exclusive groups cannot be nested')
 
 def _prog_name(prog=None):
     if prog is not None: