Removed Python version check related to argparse parser deep copies s…

…ince we only support Python 3.8+ now.

cmd2/__init__.py

@@ -5,12 +5,8 @@
 
 import sys
 
-# For python 3.8 and later
-if sys.version_info >= (3, 8):
-    import importlib.metadata as importlib_metadata
-else:
-    # For everyone else
-    import importlib_metadata
+import importlib.metadata as importlib_metadata
+
 try:
     __version__ = importlib_metadata.version(__name__)
 except importlib_metadata.PackageNotFoundError:  # pragma: no cover

cmd2/cmd2.py

@@ -700,10 +700,7 @@ def _build_parser(
         elif callable(parser_builder):
             parser = parser_builder()
         elif isinstance(parser_builder, argparse.ArgumentParser):
-            if sys.version_info >= (3, 6, 4):
-                parser = copy.deepcopy(parser_builder)
-            else:  # pragma: no cover
-                parser = parser_builder
+            parser = copy.deepcopy(parser_builder)
         return parser
 
     def _register_command_parser(self, command: str, command_method: Callable[..., Any]) -> None:
@@ -780,7 +777,7 @@ def unregister_command_set(self, cmdset: CommandSet) -> None:
 
             methods: List[Tuple[str, Callable[[Any], Any]]] = inspect.getmembers(
                 cmdset,
-                predicate=lambda meth: isinstance(meth, Callable)  # type: ignore[arg-type, var-annotated]
+                predicate=lambda meth: isinstance(meth, Callable)  # type: ignore[arg-type]
                 and hasattr(meth, '__name__')
                 and meth.__name__.startswith(COMMAND_FUNC_PREFIX),
             )
@@ -811,7 +808,7 @@ def unregister_command_set(self, cmdset: CommandSet) -> None:
     def _check_uninstallable(self, cmdset: CommandSet) -> None:
         methods: List[Tuple[str, Callable[[Any], Any]]] = inspect.getmembers(
             cmdset,
-            predicate=lambda meth: isinstance(meth, Callable)  # type: ignore[arg-type, var-annotated]
+            predicate=lambda meth: isinstance(meth, Callable)  # type: ignore[arg-type]
             and hasattr(meth, '__name__')
             and meth.__name__.startswith(COMMAND_FUNC_PREFIX),
         )
@@ -3328,19 +3325,14 @@ def _cmdloop(self) -> None:
     #############################################################
 
     # Top-level parser for alias
-    @staticmethod
-    def _build_alias_parser() -> argparse.ArgumentParser:
-        alias_description = (
-            "Manage aliases\n" "\n" "An alias is a command that enables replacement of a word by another string."
-        )
-        alias_epilog = "See also:\n" "  macro"
-        alias_parser = argparse_custom.DEFAULT_ARGUMENT_PARSER(description=alias_description, epilog=alias_epilog)
-        alias_subparsers = alias_parser.add_subparsers(dest='subcommand', metavar='SUBCOMMAND')
-        alias_subparsers.required = True
-        return alias_parser
+    alias_description = "Manage aliases\n" "\n" "An alias is a command that enables replacement of a word by another string."
+    alias_epilog = "See also:\n" "  macro"
+    alias_parser = argparse_custom.DEFAULT_ARGUMENT_PARSER(description=alias_description, epilog=alias_epilog)
+    alias_subparsers = alias_parser.add_subparsers(dest='subcommand', metavar='SUBCOMMAND')
+    alias_subparsers.required = True
 
     # Preserve quotes since we are passing strings to other commands
-    @with_argparser(_build_alias_parser, preserve_quotes=True)
+    @with_argparser(alias_parser, preserve_quotes=True)
     def do_alias(self, args: argparse.Namespace) -> None:
         """Manage aliases"""
         # Call handler for whatever subcommand was selected

cmd2/decorators.py

@@ -243,7 +243,8 @@ def _set_parser_prog(parser: argparse.ArgumentParser, prog: str) -> None:
 
             # We can break since argparse only allows 1 group of subcommands per level
             break
-        # need to save required args so they can be prepended to the subcommand usage
+
+        # Need to save required args so they can be prepended to the subcommand usage
         elif action.required:
             req_args.append(action.dest)
 

docs/features/argument_processing.rst

@@ -75,13 +75,6 @@ Here's what it looks like::
          for i in range(min(repetitions, self.maxrepeats)):
             self.poutput(arg)
 
-.. warning::
-
-    It is important that each command which uses the ``@with_argparser``
-    decorator be passed a unique instance of a parser since command-specific
-    changes could be made to it.
-
-
 .. note::
 
    The ``@with_argparser`` decorator sets the ``prog`` variable in the argument