def options(self, context, module_options):
        """
        USER	Choose a username to query group membership
        """

        self.user = ""
        if "USER" in module_options:
            if module_options["USER"] == "":
                context.log.fail("Invalid value for USER option!")
                exit(1)
            self.user = module_options["USER"]
        else:
            context.log.fail("Missing USER option, use --options to list available parameters")
            exit(1)

        USER	Choose a username to query group membership
        
cme/modules/groupmembership.py