list of all EC2 instances created by IAM user

ListInstanceOwner.py

import boto3

ec2 = boto3.client('ec2')
cloudtrail = boto3.client('cloudtrail')

def get_user(instanceid):
	response = cloudtrail.lookup_events (
		LookupAttributes=[
			{
				'AttributeKey': 'ResourceName',
				'AttributeValue': instanceid
			}
		],
	)
	return response


def get_ec2_owner(instanceid):
	user_details = get_user (instanceid)
	for event in user_details.get ("Events"):
		if event.get ("EventName") == "RunInstances":
			return event.get ("Username")


response = ec2.describe_instances (Filters=[
	{
		'Name': 'instance-state-name',
		'Values': ['running']
	}
])

for r in response['Reservations']:
	for instance in r['Instances']:
		user = get_ec2_owner (instance['InstanceId'])
		print (instance['InstanceId'],user)