chore: change PYTHON_LATEST from static versioning to a function

packages/@aws-cdk/aws-eks-v2-alpha/lib/kubectl-provider.ts

@@ -169,7 +169,7 @@ export class KubectlProvider extends Construct implements IKubectlProvider {
       role: props.role,
       code: lambda.Code.fromAsset(path.join(__dirname, 'kubectl-handler')),
       handler: 'index.handler',
-      runtime: lambda.Runtime.PYTHON_LATEST,
+      runtime: lambda.Runtime.determineLatestPythonRuntime(this),
       // defined only when using private access
       vpc,
       securityGroups,

packages/aws-cdk-lib/aws-ecs/lib/drain-hook/instance-drain-hook.ts

@@ -62,7 +62,7 @@ export class InstanceDrainHook extends Construct {
     const fn = new lambda.Function(this, 'Function', {
       code: lambda.Code.fromInline(fs.readFileSync(path.join(__dirname, '..', '..', '..', 'custom-resource-handlers', 'dist', 'aws-ecs', 'lambda-source', 'index.py'), { encoding: 'utf-8' })),
       handler: 'index.lambda_handler',
-      runtime: lambda.Runtime.PYTHON_LATEST,
+      runtime: lambda.Runtime.determineLatestPythonRuntime(this),
       // Timeout: some extra margin for additional API calls made by the Lambda,
       // up to a maximum of 15 minutes.
       timeout: cdk.Duration.seconds(Math.min(drainTime.toSeconds() + 10, 900)),

packages/aws-cdk-lib/aws-lambda/lib/runtime.ts

@@ -201,11 +201,6 @@ export class Runtime {
     supportsSnapStart: true,
   });
 
-  /**
-   * The latest Python version currently available in ALL regions.
-   */
-  public static readonly PYTHON_LATEST = this.PYTHON_3_13;
-
   /**
    * The Java 8 runtime (java8)
    * @deprecated Legacy runtime no longer supported by AWS Lambda. Migrate to the latest Java runtime.
@@ -342,6 +337,15 @@ export class Runtime {
    */
   public static readonly FROM_IMAGE = new Runtime('FROM_IMAGE');
 
+  /**
+   * The latest Python version currently available
+   */
+  // Will ignore the fact that scope is not yet being used, but it will be
+  // @ts-ignore
+  public static determineLatestPythonRuntime(scope: Construct): Runtime {
+    return this.PYTHON_3_13;
+  }
+
   /**
    * The name of this runtime, as expected by the Lambda resource.
    */
@@ -419,3 +423,4 @@ export function determineLatestNodeRuntime(scope: Construct): Runtime {
   const runtimeName = Stack.of(scope).regionalFact(FactName.LATEST_NODE_RUNTIME, Runtime.NODEJS_18_X.name);
   return new Runtime(runtimeName, RuntimeFamily.NODEJS, { supportsInlineCode: true, isVariable: true });
 }
+

packages/aws-cdk-lib/aws-s3/lib/notifications-resource/notifications-resource-handler.ts

@@ -96,7 +96,7 @@ export class NotificationsResourceHandler extends Construct {
          *   1. Unit test Dockerfile: https://github.com/aws/aws-cdk/blob/main/packages/%40aws-cdk/custom-resource-handlers/test/aws-s3/notifications-resource-handler/Dockerfile
          *   2. Custom Resource Handler Framework: https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-s3/lib/notifications-resource/notifications-resource-handler.ts
          */
-        Runtime: Runtime.PYTHON_LATEST.name,
+        Runtime: Runtime.determineLatestPythonRuntime(this).name,
         Timeout: 300,
       },
     });

packages/aws-cdk-lib/aws-s3/test/notification.test.ts

@@ -489,7 +489,7 @@ describe('notification', () => {
     });
 
     Template.fromStack(stack).hasResourceProperties('AWS::Lambda::Function', {
-      Runtime: lambda.Runtime.PYTHON_LATEST.name,
+      Runtime: 'python3.13',
     });
   });
 

packages/aws-cdk-lib/aws-stepfunctions-tasks/test/emrcontainers/start-job-run.test.ts

@@ -1126,7 +1126,7 @@ describe('Custom resource is created that has correct EKS namespace, environment
         },
       ],
       MemorySize: 256,
-      Runtime: lambda.Runtime.PYTHON_LATEST.name,
+      Runtime: 'python3.13',
       Timeout: 30,
     });
   });
@@ -1218,7 +1218,7 @@ describe('Custom resource is created that has correct EKS namespace, environment
         },
       ],
       MemorySize: 256,
-      Runtime: lambda.Runtime.PYTHON_LATEST.name,
+      Runtime: 'python3.13',
       Timeout: 30,
     });
   });

packages/aws-cdk-lib/custom-resources/test/custom-resource-config/custom-resource-config.test.ts

@@ -437,7 +437,7 @@ describe('when custom resource lambda runtime is set by addLambdaRuntime', () =>
     // THEN
     const template = Template.fromStack(stack);
     template.hasResourceProperties('AWS::Lambda::Function', {
-      Runtime: lambda.Runtime.PYTHON_LATEST.name,
+      Runtime: 'python3.13',
     });
   });