deregami.py

import boto3 
from datetime import datetime, timedelta
import time 
client = boto3.client('ec2', region_name='us-east-1')
ec2Usedamis = client.describe_instances()
ec2UsedamiList=[]
oldamilist = []
for ec2ami in range(len(ec2['Reservations'])):
    ec2UsedamiList.append(ec2['Reservations'][ec2ami]['Instances'][0]['ImageId'])
createdAMI = client.describe_images(Owners=['self'])
for ami in range(len(createdAMI['Images'])):
    amiCreationDate=datetime.strptime(response['Images'][ami]['CreationDate'], '%Y-%m-%dT%H:%M:%S.000Z')
    AMIAge=(datetime.now() - amiCreationDate).days
    if int(AMIAge) > 180:
        oldamilist.append(createdAMI['Images'][ami]['ImageId'])
        deleteList=list(set(oldamilist).difference(ec2Usedamis))

# Deregister AMI Code 
for deleteami in deleteList:
    try:
        cleanupImage = client.describe_images(Owners=['self'], ImageIds=[deleteami])
        #client.deregister_image(ImageId=deleteami)

        # Get Snapshots 
        time.sleep(10)
        for snapshots in range(len(cleanupImage['Images']['BlockDeviceMappings'])):
            print(cleanupImage['Images']['BlockDeviceMappings'][snapshots]['Ebs']['SnapshotIds'])
            #client.delete_snapshot(cleanupImage['Images']['BlockDeviceMappings'][snapshots]['Ebs']['SnapshotIds'])
    except:
        print("failed to delete AMI: " + deleteami)