def get_connection(self, connection_string):
        if self.connections not in connection_string:
            conn = libvirt.open(connection_string)
            self.connections[connection_string] = conn
        else:
            conn = self.connections[connection_string]
        return conn
dataset/ETHPy150Open openstack/fuel-devops/devops/driver/libvirt/libvirt_driver.py/_LibvirtManager.get_connection/swapped operands of `not in`