如何从boto3 cloudformation describe_stack接口中只获取OutputKey？

Question

需要帮助！我正在尝试使用boto3部署CloudFormation堆栈。在cloudformation模板中，使用下面的输出参数代码。当我运行describe_stack时，它向我显示了堆栈和所有属性的完整描述。如何从下面的OutputKeys中仅获取其中的一部分？例如，如果我只想要PublicDNS或PublicIP怎么办？

Outputs:
  InstanceId:
    Description: InstanceId of the newly created EC2 instance
    Value: !Ref EC2Instance
  AZ:
    Description: Availability Zone of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance
      - AvailabilityZone
  PublicDNS:
    Description: Public DNSName of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance
      - PublicDnsName
  PublicIP:
    Description: Public IP address of the newly created EC2 instance
    Value: !GetAtt 
      - EC2Instance
      - PublicIp

Answer 1

在Stack的帮助下，您可以执行以下操作(PublicDNS示例

import boto3

session = boto3.Session(aws_access_key_id='', aws_secret_access_key=''...) 

cloudformation = session.resource('cloudformation')

stack = cloudformation.Stack('<your-stack-name>')

print(stack.outputs)

public_dns = ''

for output in stack.outputs:
    if output['OutputKey'] == 'PublicDNS':
        public_dns = output['OutputValue']
        break

print(public_dns)