场景：由于并发或者需求来临之时，需要添加RDS数据库只读实例的机器数量，通过手动添加较慢，现则编写一脚本可批量快速添加。

#!/usr/bin/env python
#coding=utf-8

def create_rds():
    #安装阿里云Python SDK,pip install aliyun-python-sdk-core,pip install aliyun-python-sdk-ecs
    from aliyunsdkcore.client import AcsClient 
    from aliyunsdkcore.acs_exception.exceptions import ClientException
    from aliyunsdkcore.acs_exception.exceptions import ServerException
    from aliyunsdkrds.request.v20140815.CreateReadOnlyDBInstanceRequest import CreateReadOnlyDBInstanceRequest
    

    access_key_id = 'xxxxxxxxxxxxxxxx'
    your_accesskey_secret = 'xxxxxxxxxxxxxxxxxxxxxxxxxxx'
    your_region_id = 'xxxxxxxxx'
    client = AcsClient(access_key_id, your_accesskey_secret, your_region_id)
    
    #需要阿里云ram授权获取access_key

    request = CreateReadOnlyDBInstanceRequest()
    request.set_accept_format('json')

    request.set_ZoneId("cn-shenzhen-e")
    request.set_DBInstanceId("rm-wz9k4pbbl5mhbXXX")
    request.set_DBInstanceClass("rds.mysql.s3.large")
    request.set_DBInstanceStorage(150)
    request.set_EngineVersion("5.7")
    request.set_PayType("Postpaid")
    request.set_InstanceNetworkType("VPC")
    request.set_VPCId("vpc-wz9gnt2uralXXXXXXXX")
    request.set_VSwitchId("vsw-wz94lk1d25xxxxxxx")
    #输入添加实例的规格
    response = client.do_action_with_exception(request)
    return response
    #创建单台只读实例节点
    #print(str(response,encoding='utf-8'))


rds_num = input('请输入需要增加rds只读节点的数量(1-3台，只读实例最大数量为5，确认实际数量再输入)：')
for i in range(rds_num):
    a = create_rds()
    a = a.find('mysql.rds.aliyuncs.com')
    if a >= 0:
        print('已开始添加第{}台'.format(i+1))
    else:
        print('第{}台添加失败'.format(i+1))
        break
#调用函数，添加需要的数量