python - 按 VPC ID 列出 AWS 中的子网

Question

我需要列出 AWS 中特定 VPC 中的子网。

当我这样做时，我收到此错误:

Traceback (most recent call last):
  File ".\aws_create_ec2.py", line 253, in <module>
    main()
  File ".\aws_create_ec2.py", line 249, in main
    create_instances()
  File ".\aws_create_ec2.py", line 146, in create_instances
    subnet_list = ec2_client.describe_subnets(
  File "C:\Users\User\AppData\Local\Programs\Python\Python38-32\lib\site-packages\botocore\client.py", line 272, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "C:\Users\User\AppData\Local\Programs\Python\Python38-32\lib\site-packages\botocore\client.py", line 548, in _make_api_call
    request_dict = self._convert_to_request_dict(
  File "C:\Users\User\AppData\Local\Programs\Python\Python38-32\lib\site-packages\botocore\client.py", line 596, in _convert_to_request_dict
    request_dict = self._serializer.serialize_to_request(
  File "C:\Users\User\AppData\Local\Programs\Python\Python38-32\lib\site-packages\botocore\validate.py", line 297, in serialize_to_request
    raise ParamValidationError(report=report.generate_report())
botocore.exceptions.ParamValidationError: Parameter validation failed:
Unknown parameter in input: "VpcIds", must be one of: Filters, SubnetIds, DryRun, NextToken, MaxResults

我正在使用这些命令:

 vpc_id = input("Enter the vpc id: ")
 subnet_list = ec2_client.describe_subnets(
     VpcIds=[
         vpc_id,
       ]
    )

如何使用此命令正确过滤我想要的 VPC？

另外，如何使用正则表达式验证用户输入以使其符合正确的格式？例如，用户输入与类似以下内容匹配:vpc-68b1ff12

Answer 1

该错误消息意味着 VpcIds 不是 describe_subnets 的有效参数。有效参数列表记录在here中.

在 VPC 中获取子网的另一种方法是:

subnets = boto3.resource("ec2").subnets.filter(
    Filters=[{"Name": "vpc-id", "Values": [vpc_id]}]
)
subnet_ids = [sn.id for sn in subnets]