无法在aws中找到select_subnets函数

Question

我试图使用subnet_group_name属性在AWS中使用aws_ec2.Vpc的select_subnets方法选择私有子网，如下代码段所述：

from aws_cdk import core as cdk
from aws_cdk import aws_ec2 as ec2
from aws_cdk import core

class SimpleCdkStack(cdk.Stack):

def __init__(self, scope: cdk.Construct, construct_id: str, **kwargs) -> None:
    super().__init__(scope, construct_id, **kwargs)
    subnets = ec2.Vpc.select_subnets(self,
        subnet_group_name="private-subnet"
    )
    print("Subnet Ids: " + subnets.subnet_ids)

上述错误在执行过程中会产生以下错误：

$ cdk diff

jsii.errors.JavaScriptError:
Error: Class @aws-cdk/core.Stack doesn't have a method 'selectSubnets'
  at Kernel._typeInfoForMethod (/tmp/tmphu1erjw6/lib/program.js:8420:27)
  at Kernel._findInvokeTarget (/tmp/tmphu1erjw6/lib/program.js:8340:33)
  at Kernel.invoke (/tmp/tmphu1erjw6/lib/program.js:7966:44)
  at KernelHost.processRequest (/tmp/tmphu1erjw6/lib/program.js:9479:36)
  at KernelHost.run (/tmp/tmphu1erjw6/lib/program.js:9442:22)
  at Immediate._onImmediate (/tmp/tmphu1erjw6/lib/program.js:9443:46)
  at processImmediate (internal/timers.js:461:21)

我已经使用以下命令安装了所需的软件包

$ pip install aws_cdk.aws_ec2

不知道我哪里出了问题。

AWS清楚地提到了aws_ec2.Vpc类这里可用的方法。

帮助感激！

Answer 1

您应该将Vpc引用作为第一个参数传递给select_subnet调用，但实际上已经传递了self，这是一个CDK。

示例

from aws_cdk import aws_ec2 as ec2
from aws_cdk import core as cdk


class SimpleCdkStack(cdk.Stack):

    def __init__(self, scope: cdk.Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)

        subnet_ids = ec2.Vpc.from_lookup(
            vpc_id='your vpc id'
        ).select_subnets(
            subnet_group_name="private-subnet"
        ).subnet_ids

        for subnet_id in subnet_ids:
            print("Subnet Ids: " + subnet_id)