How to use the shyaml.ActionTypeError function in shyaml

## Note: ``\n`` will be transformed by ``universal_newlines`` mecanism for
    ## any platform
    termination = "\0" if action.endswith("-0") else "\n"

    if action == "get-value":
        return str(dump(value))
    elif action in ("get-values", "get-values-0"):
        if isinstance(value, dict):
            return "".join("".join((dump(k), termination,
                                    dump(v), termination))
                           for k, v in value.items())
        elif isinstance(value, list):
            return "".join("".join((dump(l), termination))
                           for l in value)
        else:
            raise ActionTypeError(
                action, provided=tvalue, expected=["sequence", "struct"])
    elif action == "get-type":
        return tvalue
    elif action == "get-length":
        if isinstance(value, (dict, list)):
            return len(value)
        else:
            raise ActionTypeError(
                action, provided=tvalue, expected=["sequence", "struct"])
    elif action in ("keys", "keys-0",
                    "values", "values-0",
                    "key-values", "key-values-0"):
        if isinstance(value, dict):
            method = value.keys if action.startswith("keys") else \
                value.items if action.startswith("key-values") else \
                value.values

return "".join("".join((dump(k), termination,
                                    dump(v), termination))
                           for k, v in value.items())
        elif isinstance(value, list):
            return "".join("".join((dump(l), termination))
                           for l in value)
        else:
            raise ActionTypeError(
                action, provided=tvalue, expected=["sequence", "struct"])
    elif action == "get-type":
        return tvalue
    elif action == "get-length":
        if isinstance(value, (dict, list)):
            return len(value)
        else:
            raise ActionTypeError(
                action, provided=tvalue, expected=["sequence", "struct"])
    elif action in ("keys", "keys-0",
                    "values", "values-0",
                    "key-values", "key-values-0"):
        if isinstance(value, dict):
            method = value.keys if action.startswith("keys") else \
                value.items if action.startswith("key-values") else \
                value.values
            output = (lambda x: termination.join(str(dump(e)) for e in x)) \
                if action.startswith("key-values") else \
                dump
            return "".join("".join((str(output(k)), termination)) for k in method())
        else:
            raise ActionTypeError(
                action=action, provided=tvalue, expected=["struct"])
    else:

else:
            raise ActionTypeError(
                action, provided=tvalue, expected=["sequence", "struct"])
    elif action in ("keys", "keys-0",
                    "values", "values-0",
                    "key-values", "key-values-0"):
        if isinstance(value, dict):
            method = value.keys if action.startswith("keys") else \
                value.items if action.startswith("key-values") else \
                value.values
            output = (lambda x: termination.join(str(dump(e)) for e in x)) \
                if action.startswith("key-values") else \
                dump
            return "".join("".join((str(output(k)), termination)) for k in method())
        else:
            raise ActionTypeError(
                action=action, provided=tvalue, expected=["struct"])
    else:
        raise InvalidAction(action)