Delete older EBS snapshots using `boto3`

delete_ebs_snapshots.py

#!/usr/bin/env python


##### THIS IS A DESTRUCTIVE SCRIPT - USE WITH CAUTION OR SET DryRun=True

import datetime
import sys
import boto3

# Set these two variables before running:
age = 90             # Days to retain
dryrun = False       # Set whether to actually delete or not [True|False]

aws_profile_name = 'uvarc'
def days_old(date):
    date_obj = date.replace(tzinfo=None)
    diff = datetime.datetime.now() - date_obj
    return diff.days

boto3.setup_default_session(profile_name = aws_profile_name)
ec2 = boto3.client('ec2')
amis = ec2.describe_snapshots(OwnerIds=[
        'self'
        ])
    # ], MaxResults=90000)
for ami in amis['Snapshots']:
    create_date = ami['StartTime']
    snapshot_id = ami['SnapshotId']
    day_old = days_old(create_date)
    if day_old > age:
        try:
            print("deleting -> " + snapshot_id + " as image is " + str(day_old)  + " old.")
            # delete the snapshot
            ec2.delete_snapshot(SnapshotId=snapshot_id,DryRun=dryrun)
        except:
            print("can't delete " + snapshot_id)