Fixed mypy and flake8 errors.

Author: kmvanbrunt

cmd2/argparse_custom.py

@@ -276,7 +276,7 @@ def my_completer(self, text, line, begidx, endidx, arg_tokens)
         runtime_checkable,
     )
 except ImportError:
-    from typing_extensions import (  # type: ignore[misc]
+    from typing_extensions import (  # type: ignore[assignment]
         Protocol,
         runtime_checkable,
     )

cmd2/cmd2.py

@@ -2431,7 +2431,8 @@ def onecmd_plus_hooks(
             if raise_keyboard_interrupt and not stop:
                 raise ex
         except SystemExit as ex:
-            self.exit_code = ex.code
+            if isinstance(ex.code, int):
+                self.exit_code = ex.code
             stop = True
         except PassThroughException as ex:
             raise ex.wrapped_ex
@@ -2444,7 +2445,8 @@ def onecmd_plus_hooks(
                 if raise_keyboard_interrupt and not stop:
                     raise ex
             except SystemExit as ex:
-                self.exit_code = ex.code
+                if isinstance(ex.code, int):
+                    self.exit_code = ex.code
                 stop = True
             except PassThroughException as ex:
                 raise ex.wrapped_ex

setup.cfg

@@ -9,7 +9,7 @@ addopts =
 
 [flake8]
 count = True
-ignore = E203,E231,W503  # E231 can be removed once black is fixed.
+ignore = E203,W503
 max-complexity = 26
 max-line-length = 127
 show-source = True