等到我的情况变为真实 - 而真正的蟒蛇

Question

如何在python中使用而True ？在这里，我试图编写一个python boto3脚本来停止所有处于可用状态的 RDS 实例。在停止之前，我需要将 MultiAZ 部署的实例更改为无。我想等待实例按顺序修改以停止实例。如何通过等到条件变为真实来完成同样的事情？

import boto3

client = boto3.client('rds')

dbmultiAZ=[]

def lambda_handler(event,context):
 response=client.describe_db_instances()

  for i in response['DBInstances']:
    if i['DBInstanceStatus'] == 'available':
        dbmultiAZ.append(i['DBInstanceIdentifier'])


        for j in dbmultiAZ:
            if i['MultiAZ']==True:
                response1 = client.modify_db_instance(
                    DBInstanceIdentifier=i['DBInstanceIdentifier'],
                    ApplyImmediately=True,
                    MultiAZ=False
                    )

            else:
                dbmultiAZ.append(i['DBInstanceIdentifier'])


            for z in dbmultiAZ:
                waiter = client.get_waiter('db_instance_available')
                waiter.wait(
                    DBInstanceIdentifier=z )
                    response2 = client.stop_db_instance(
                        DBInstanceIdentifier=z
                        )