Fixed missing dependency for Python 3.10

Author: kmvanbrunt

CHANGELOG.md

@@ -1,3 +1,8 @@
+## 3.1.2 (January 26, 2026)
+
+- Bug Fixes
+    - Fixed missing `typing-extensions` dependency for Python 3.10
+
 ## 3.1.1 (January 26, 2026)
 
 - Bug Fixes

cmd2/argparse_custom.py

@@ -290,7 +290,12 @@ def get_items(self) -> list[CompletionItems]:
     RawTextRichHelpFormatter,
     RichHelpFormatter,
 )
-from typing_extensions import Self
+
+if sys.version_info >= (3, 11):
+    from typing import Self
+else:
+    from typing_extensions import Self
+
 
 from . import constants
 from . import rich_utils as ru

cmd2/parsing.py

@@ -2,14 +2,18 @@
 
 import re
 import shlex
+import sys
 from collections.abc import Iterable
 from dataclasses import (
     dataclass,
     field,
 )
 from typing import Any
 
-from typing_extensions import Self
+if sys.version_info >= (3, 11):
+    from typing import Self
+else:
+    from typing_extensions import Self
 
 from . import (
     constants,

pyproject.toml

@@ -35,6 +35,7 @@ dependencies = [
     "pyreadline3>=3.4; platform_system == 'Windows'",
     "rich>=14.3.0",
     "rich-argparse>=1.7.1",
+    "typing-extensions; python_version == '3.10'",
 ]
 
 [dependency-groups]