def arg_strings(parsed_args, name=None):
    """A list of all strings for the named arg"""
    name = name or 'arg_strings'
    value = getattr(parsed_args, name, [])
    if isinstance(value, str):
        return [value]
    try:
        return [v for v in value if isinstance(v, str)]
    except TypeError:
        return []
A list of all strings for the named arg