How to use the shyaml.InvalidPath function in shyaml

else:
                if opts["action"] not in ACTION_SUPPORTING_STREAMING:
                    die("Source YAML is multi-document, "
                        "which doesn't support any other action than %s"
                        % ", ".join(ACTION_SUPPORTING_STREAMING))
                if opts["dump"] is yaml_dump:
                    print("---\n", end="")
                else:
                    print("\0", end="")
                if opts.get("loader") is LineLoader:
                    sys.stdout.flush()

            print(output, end="")
            if opts.get("loader") is LineLoader:
                sys.stdout.flush()
    except (InvalidPath, ActionTypeError) as e:
        if quiet:
            exit(1)
        else:
            die(str(e))
    except InvalidAction as e:
        die("'%s' is not a valid action.\n%s"
            % (e.args[0], USAGE))

def traverse(contents, path, default=None):
    try:
        try:
            value = mget(contents, path)
        except (IndexOutOfRange, MissingKeyError):
            if default is None:
                raise
            value = default
    except (IndexOutOfRange, MissingKeyError,
            NonDictLikeTypeError, IndexNotIntegerError) as exc:
        msg = str(exc)
        raise InvalidPath(
            "invalid path %r, %s"
            % (path, msg.replace('list', 'sequence').replace('dict', 'struct')))
    return value