validate_no_namespace

class ValidateNoNamespace(plugin.MayaInstancePlugin,
                          OptionalPyblishPluginMixin):
    """Ensure the nodes don't have a namespace"""

    order = ValidateContentsOrder
    families = ['model']
    label = 'No Namespaces'
    actions = [ayon_maya.api.action.SelectInvalidAction,
               RepairAction]
    optional = False

    @staticmethod
    def get_invalid(instance):
        nodes = cmds.ls(instance, long=True)
        return [node for node in nodes if get_namespace(node)]

    def process(self, instance):
        """Process all the nodes in the instance"""
        if not self.is_active(instance.data):
            return
        invalid = self.get_invalid(instance)

        if invalid:
            invalid_namespaces = {get_namespace(node) for node in invalid}
            raise PublishValidationError(
                message="Namespaces found:\n\n{0}".format(
                    _as_report_list(sorted(invalid_namespaces))
                ),
                title="Namespaces in model",
                description=(
                    "## Namespaces found in model\n"
                    "It is not allowed to publish a model that contains "
                    "namespaces."
                )
            )

    @classmethod
    def repair(cls, instance):
        """Remove all namespaces from the nodes in the instance"""

        invalid = cls.get_invalid(instance)

        # Iterate over the nodes by long to short names to iterate the lowest
        # in hierarchy nodes first. This way we avoid having renamed parents
        # before renaming children nodes
        for node in sorted(invalid, key=len, reverse=True):

            node_name = node.rsplit("|", 1)[-1]
            node_name_without_namespace = node_name.rsplit(":")[-1]
            cmds.rename(node, node_name_without_namespace)