TARGET_INSTANE_ID = 'i-********' def check_instance_id(TARGET_INSTANE_ID): event_msg = event['Reservations'] count = len(event_msg) for n in range(0,count): InstanceId = event['Reservations'][n]['Instances']['InstanceId'] if InstanceId == TARGET_INSTANE_ID: msg = "OK" else: msg = "NG" print(msg) return msg { "Reservations": [ { "OwnerId": "************", "ReservationId": "r-********", "Groups": []