Amazon web services 使用AWS CDK时Lambda函数无法实例化

我试图使用AWS CDK部署一个Lambda函数，该函数将由S3上载事件触发。当我尝试执行

cdk ls

或

cdk synth

时，我得到了错误：

Traceback (most recent call last):
  File "app.py", line 14, in <module>
    S3TosqsStack(app, "S3TosqsStack", env=core.Environment(account=os.getenv('CDK_DEFAULT_ACCOUNT'), region=os.getenv('CDK_DEFAULT_REGION')))
  File "/home/ec2-user/s3tosqs/.venv/lib64/python3.7/site-packages/jsii/_runtime.py", line 83, in __call__
    inst = super().__call__(*args, **kwargs)
  File "/home/ec2-user/s3tosqs/s3tosqs/s3tosqs_stack.py", line 37, in __init__
    bucket=s3.IBucket(bucket_name=lambda_deployment_bucket),
  File "/home/ec2-user/s3tosqs/.venv/lib64/python3.7/site-packages/typing_extensions.py", line 1548, in _no_init
    raise TypeError('Protocols cannot be instantiated')
TypeError: Protocols cannot be instantiated
Subprocess exited with error 1

---

您是否尝试过使用bucket和from_bucket_name使用bucket引用

        lambda_function = _lambda.Function(
        self, 'S3toSQS',
        runtime=_lambda.Runtime.PYTHON_3_8,
        code=_lambda.Code.from_bucket(
            bucket=s3.Bucket.from_bucket_name(self, "id",bucket_name=lambda_deployment_bucket),
            key='S3toSQS.zip'),
        handler='handler.publish_SQS_message',
        environment={'SOURCE_BUCKET': trigger_bucket,
                     'REGION': region,
                     'QUEUE_NAME': queue.queue_name}
    )

---

您遇到的问题可能有两个原因

修改代码，如下所示。修改在第4行，以调用“from_bucket”方法的参数的方式进行

lambda\u函数=\u lambda.function(
self，'S3toSQS'，
runtime=\u lambda.runtime.PYTHON\u 3\u 8，
code=\u lambda.code.from\u bucket（s3.IBucket（bucket\u name=lambda\u deployment\u bucket），'S3toSQS.zip'），
handler='handler.publish_SQS_message'，
环境={'SOURCE_BUCKET'：触发器_BUCKET，
"地区":地区,，
“队列名称”：队列名称}
)

您正在使用Python 3.7运行CDK代码。据我所知，该版本的Python不支持协议类型，因此出现了错误。尝试升级到Python 3.8

        lambda_function = _lambda.Function(
        self, 'S3toSQS',
        runtime=_lambda.Runtime.PYTHON_3_8,
        code=_lambda.Code.from_bucket(
            bucket=s3.Bucket.from_bucket_name(self, "id",bucket_name=lambda_deployment_bucket),
            key='S3toSQS.zip'),
        handler='handler.publish_SQS_message',
        environment={'SOURCE_BUCKET': trigger_bucket,
                     'REGION': region,
                     'QUEUE_NAME': queue.queue_name}
    )