Finds the given Django management command and default options,
        excluding this command, and calls it with the given arguments
        and override options.

def call_command(self, name, *arguments, **options):
        """
        Finds the given Django management command and default options,
        excluding this command, and calls it with the given arguments
        and override options.
        
        """
        command, defaults = get_command_and_defaults(
            name,
            exclude_packages=self.get_exclude_packages(),
            exclude_command_class=self.__class__)
        if command is None:
            raise management.CommandError(
                "Unknown command: {name:s}".format(
                    name=name))
        defaults.update(options)
        return command.execute(*arguments, **defaults)