def _removeSecurityGroup(self, input_dict, req, instance_id):
        context = req.environ['nova.context']

        try:
            body = input_dict['removeSecurityGroup']
            group_name = body['name']
            instance_id = int(instance_id)
        except ValueError:
            msg = _("Server id should be integer")
            raise exc.HTTPBadRequest(explanation=msg)
        except TypeError:
            msg = _("Missing parameter dict")
            raise webob.exc.HTTPBadRequest(explanation=msg)
        except KeyError:
            msg = _("Security group not specified")
            raise webob.exc.HTTPBadRequest(explanation=msg)

        if not group_name or group_name.strip() == '':
            msg = _("Security group name cannot be empty")
            raise webob.exc.HTTPBadRequest(explanation=msg)

        try:
            self.compute_api.remove_security_group(context, instance_id,
                                                   group_name)
        except exception.SecurityGroupNotFound as exp:
            return exc.HTTPNotFound(explanation=unicode(exp))
        except exception.InstanceNotFound as exp:
            return exc.HTTPNotFound(explanation=unicode(exp))
        except exception.Invalid as exp:
            return exc.HTTPBadRequest(explanation=unicode(exp))

        return exc.HTTPAccepted()
dataset/ETHPy150Open nii-cloud/dodai-compute/nova/api/openstack/contrib/security_groups.py/Security_groups._removeSecurityGroup/original