How to get public_dns_name according to ec2 resource instance?

Now I want to get the public_dns_name, and then log on to an instance of aws to get the CPU utilization. I know that I can check it with cloudwatch, but now I don't want to rely on the function provided by amazon to check it directly based on Linux. How can I get it?

ec2 = boto3.resource('ec2',
                     aws_access_key_id=settings.AWS.get("aws_access_key_id"),
                     aws_secret_access_key=settings.AWS.get("aws_secret_access_key"),
                     region_name=settings.AWS.get("region_name"))

user_data_script = """#cloud-config
   runcmd:
    - sudo systemctl start docker
    - cd /srv/app/kfquantum
    - sudo docker run --env broker=%s \
                      --env result=redis://10.0.0.245:6379/0 \
                      --env host=kf-db.cluster-crietao0wrdu.rds.cn-northwest-1.amazonaws.com.cn \
                      --env user=db \
                      --env pw=y6y83aGagY8hgXZ \
                      -w /kfquantum -d --restart unless-stopped --name kf-celery kf-celery \
                      celery -A kfquantum worker --pool=solo -l info
   """ % settings.BROKER_URL
instance_type = "c5.large"
instance = ec2.create_instances(
    BlockDeviceMappings=[
        {
            "DeviceName": "/dev/xvda",
            'Ebs': {
                'DeleteOnTermination': True,
                'VolumeSize': 8
            },
        },
    ],
    ImageId="ami-09feea664bfc54194",
    MinCount=1,
    MaxCount=1,
    Placement={'AvailabilityZone': 'cn-northwest-1a'},
    InstanceType=instance_type,
    UserData=user_data_script,
    NetworkInterfaces=[
        {
            'DeviceIndex': 0,
            'SubnetId': "subnet-093161e8b00deb367",
            'AssociatePublicIpAddress': True
        },
    ]
)
instance = instance[0]
print("1",instance.private_ip_address)
print("2",instance.public_dns_name)

Console

1,10.0.0.73
2