我正在嘗試檢索 ec2 實例的公共 dns 名稱。這是我的python3腳本。import sysimport boto3from botocore.exceptions import ClientErrorinstance_id = "i-03e7f6391a0f523ee"action = 'ON'ec2 = boto3.client('ec2')if action == 'ON':    # Do a dryrun first to verify permissions    try:        ec2.start_instances(InstanceIds=[instance_id], DryRun=True)    except ClientError as e:        if 'DryRunOperation' not in str(e):            raise    # Dry run succeeded, run start_instances without dryrun    try:        response = ec2.start_instances(InstanceIds=[instance_id], DryRun=False)        print(response)    except ClientError as e:        print(e)else:    # Do a dryrun first to verify permissions    try:        ec2.stop_instances(InstanceIds=[instance_id], DryRun=True)    except ClientError as e:        if 'DryRunOperation' not in str(e):            raise    # Dry run succeeded, call stop_instances without dryrun    try:        response = ec2.stop_instances(InstanceIds=[instance_id], DryRun=False)        print(response)    except ClientError as e:        print(e)instance = ec2.Instance('i-1234567890123456')while instance.state['Name'] not in ('running', 'stopped'):        sleep(5)        print("the instance is initializing")#pubdns=instance.PublicDnsName#print ("public dns name"+pubdns)def get_name(inst):    client = boto3.client('ec2')    response = client.describe_instances(InstanceIds = [inst[0].instance_id])    foo = response['Reservations'][0]['Instances'][0]['NetworkInterfaces'][0]['Association']['PublicDnsName']    return foofoo = get_name(instance_id)print (foo)如果我使用ec2 = boto3.client('ec2')在上面的代碼中，出現以下錯誤：AttributeError：“ EC2”對象沒有屬性“ Instance”如果我用ec2 = boto3.resource('ec2')然后我得到這個錯誤：AttributeError：“ ec2.ServiceResource”對象沒有屬性“ start_instances”我想要做的是能夠連接到 ec2 實例并檢索其 publicdns 名稱。但是現在我得到了錯誤in get_name    response = client.describe_instances(InstanceIds = [inst[0].instance_id])AttributeError: 'str' object has no attribute 'instance_id'