stopec2instance.py

import boto3

def GetInstanceRunning():
    client = boto3.client('ec2')
    ec2_regions = [region['RegionName'] for region in client.describe_regions()['Regions']]
    for region in ec2_regions:
        ec2 = boto3.resource('ec2')
        instances = ec2.instances.filter(Filters=[{'Name': 'instance-state-name', 'Values': ['running']}])
        return [instance.id for instance in instances]

def StopInstance(ids=GetInstanceRunning()):
    ec2 = boto3.client('ec2')
    if not ids:
        print("No Instance in the state Running or pending")
    else:
        ec2.stop_instances(InstanceIds=ids)
        ec2.get_waiter('instance_stopped').wait(InstanceIds=ids)
        print('instance {} was shutdown'.format(ids))

def lambda_handler(event, context):
    StopInstance()