def add_node(self, browser):
        if not self.VALID_BROWSERS in browser:
            return False
        ip = self.get_ip()
        response = self.adapter.client.create_container('dsgrid/'+browser+'-node', [], environment={"GRID_IP": ip})
        if response['Id']:
            self.adapter.client.start(response)
            return True
dataset/ETHPy150Open brady-vitrano/dsgrid/dsgrid/hub.py/GridHub.add_node/swapped operands of `in`