Fixed mypy issues.

Author: kmvanbrunt

cmd2/argparse_utils.py

@@ -375,8 +375,7 @@ def _validate_completion_callable(self: argparse.Action, value: Any) -> Any:
 # protocols like copy.deepcopy().
 ############################################################################################################
 
-# _ColorlessTheme only exists in 3.15+
-if hasattr(argparse, "_ColorlessTheme"):
+if sys.version_info >= (3, 15):
 
     def _ColorlessTheme_getattr(_self: argparse._ColorlessTheme, name: str) -> Any:  # noqa: N802
         """Patched __getattr__ that allows dunder lookups to fail correctly."""

tests/test_argparse_utils.py

@@ -750,13 +750,13 @@ def test_argparse_output_capture(base_app: cmd2.Cmd) -> None:
     assert su.strip_style("\n".join(styled_help_out)) == "\n".join(unstyled_help_out)
 
 
+@pytest.mark.skipif(
+    sys.version_info < (3, 15),
+    reason="_ColorlessTheme only exists in 3.15+",
+)
 def test_colorless_theme_monkeypatch() -> None:
     """Test the _ColorlessTheme.__getattr__ monkey patch."""
 
-    # _ColorlessTheme only exists in 3.15+
-    if not hasattr(argparse, "_ColorlessTheme"):
-        return
-
     # If this assertion fails, then the bug no longer exists and our patch wasn't installed.
     # We can remove the patch function and this test.
     assert argparse._ColorlessTheme.__getattr__ == argparse_utils._ColorlessTheme_getattr