ArgumentParser changes between 0.9.11 and 0.9.21

Hello!

I’m trying to understand the differences in how ArgumentParsers are defined and used in this new form as I am trying to update a project.

My cmd2 app (using cmd2 0.9.11) uses the following structure:

def MyClass(cmd2.Cmd):
...

    parser = argparse_completer.ACArgumentParser()
    setattr(filter_create_sp.add_argument("my_arg"),
              argparse_completer.ACTION_ARG_CHOICES, ("_my_completer_function",))

    @cmd2.with_argparser(parser)
    def do_command(self, args):
        ...

where _my_completer_function is a method of the MyClass class.

My understanding is that the new format of this code is something along the lines of:

def MyClass(cmd2.Cmd):
...

    parser = cmd2.argparse_custom.Cmd2ArgumentParser()
    parser.add_argument("my_arg", choices_method=self._my_completer_function)

    @cmd2.with_argparser(parser)
    def do_command(self, args):
        ....

Unfortunately, I cannot work out how to pass/use self(or other reference to the instance of my cmd2 app) for the parser.add_argument("my_arg", choices_method=self._my_completer_function) line. I need the MyClass instance to be passed to my custom completer function. Am I missing something obvious?

Thanks in advance.

[kmvanbrunt]

The with_argparser decorator is used on the command’s do_xxx function.

[kmvanbrunt]

@dannypete The class is still being defined at that point, so it can’t be referenced by class name. The same principle is causing the error with your choices function. It needs to be defined before you refer to it.

This should work:

class MyClass(cmd2.Cmd):
    def _myarg_choices_function(self):
        return self.my_arg_choices

    parser = argparse_custom.Cmd2ArgumentParser()
    parser.add_argument("my_arg", choices_method=_myarg_choices_function)
    ...