Lists, snapshots, then deletes unattached EBS volumes. If NO_OP is set to True then only lists unattached EBS volumes.

cleanup_ebs.py

import boto3

NO_OP = True
REGION_NAME = 'us-west-2'

ec2r = boto3.resource('ec2', region_name=REGION_NAME)
ec2c = boto3.client('ec2', region_name=REGION_NAME)

vols = ec2r.volumes.filter(Filters=[{'Name': 'status', 'Values': ['available']}])

for vol in vols:
    print("Found unattached volume with id: {}".format(vol.id))
    if not NO_OP:
        print("Snapshotting volume...")
        ec2c.create_snapshot(VolumeId=vol.id)
        print("Deleting volume...")
        ec2c.delete_volume(VolumeId=vol.id)
    print("Proceeding to next volume...")
    print("")