Fix bug when using ipy with gnureadline and Python 3.13 (#1358)

* Fix bug when using ipy with gnureadline and Python 3.13

* Fix mypy error with IPython stuff

* Fix mypy errors when importing stuff from IPython

* Updated CHANGELOG with info on bug fix

* Added invoke task for cleaning ruff cache directory

* Added ruff cache clean invoke task to plugins

* Use the "ruff clean" command to clear all ruff cache dirs

* Made cmd2/parsing.py non-executable and examples executable

Author: tleonhardt

.github/workflows/mypy.yml

@@ -11,8 +11,8 @@ jobs:
   mypy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4  # https://github.com/actions/checkout
-      - uses: actions/setup-python@v5  # https://github.com/actions/setup-python
+      - uses: actions/checkout@v4 # https://github.com/actions/checkout
+      - uses: actions/setup-python@v5 # https://github.com/actions/setup-python
         with:
           python-version: 3.13
           allow-prereleases: true

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 2.5.1 (November TBD, 2024)
+* Bug Fixes
+  * Fixed readline bug when using `ipy` command with `gnureadline` and Python 3.13
+
 ## 2.5.0 (October 23, 2024)
 * Breaking Change
   * `cmd2` 2.5 supports Python 3.8+ (removed support for Python 3.6 and 3.7)

cmd2/cmd2.py

@@ -128,6 +128,13 @@
     StatementParser,
     shlex_split,
 )
+
+# NOTE: When using gnureadline with Python 3.13, start_ipython needs to be imported before any readline-related stuff
+try:
+    from IPython import start_ipython  # type: ignore[import]
+except ImportError:
+    pass
+
 from .rl_utils import (
     RlType,
     rl_escape_prompt,
@@ -4629,9 +4636,13 @@ def do_ipy(self, _: argparse.Namespace) -> Optional[bool]:  # pragma: no cover
         # Detect whether IPython is installed
         try:
             import traitlets.config.loader as TraitletsLoader  # type: ignore[import]
-            from IPython import (  # type: ignore[import]
-                start_ipython,
-            )
+
+            # Allow users to install ipython from a cmd2 prompt when needed and still have ipy command work
+            try:
+                start_ipython  # noqa F823
+            except NameError:
+                from IPython import start_ipython  # type: ignore[import]
+
             from IPython.terminal.interactiveshell import (  # type: ignore[import]
                 TerminalInteractiveShell,
             )