stopEC2.py

import json
import sys
import boto3
import os
from botocore.exceptions import ClientError



ec2 = boto3.client('ec2')

regions = [region['RegionName']
           for region in ec2.describe_regions()['Regions']]

def lambda_handler(event, context):
    for region in regions:
        ec2_resource = boto3.resource('ec2', region_name=region)
        print("Region :", region)

        instances = ec2_resource.instances.filter(
                Filters=[{'Name': 'instance-state-name',
                        'Values': ['running']}])
        
        # stop all running instances
        for instance in instances:
            instance.stop()
            print("Instance stopped:", instance.id)
    return {
        'statusCode': 200,
        'body': json.dumps('Hello from Lambda!')
    }