Create ebs snapshots with retention time

ebs_snapshots

import json, boto3
from datetime import datetime
from tag_name import TagName

'''
ebs_backups = EBSBackup()
ebs_backups.create_snapshots()
'''
class EBSBackup(object):
      
      RETENTION_IN_DAYS = 2
      RARIS_REGION = 'eu-west-3'

      def __init__(self, region):
          self.ec2 = boto3.client('ec2', region)
      
      def __get_retention_tag_value(self):
          return "{0} days".format(self.RETENTION_IN_DAYS)

      def __get_volumes_for_backup(self): 
          ebs_info = self.ec2.describe_volumes(Filters=[{'Name': 'tag-key', 'Values': ['backup', 'True']}])
          if not ebs_info:
             print('ec2.describe_volumes is empty list')
          volumes = ebs_info['Volumes']
          if not volumes:
             print('No volumes were found.')
          return volumes
    
      def __create_snapshot(self, volume={}):
          snapshot = self.ec2.create_snapshot(
              VolumeId=volume['VolumeId'], 
              Description="Periodical backup for ebs: " + volume['VolumeId']
          )
          if not snapshot:
              print('Can\'t create snapshot for volume {0}'.format(volume['VolumeId']))
          return snapshot

      def __add_retention_time_to_snapshot(self, snapshot={}, volume={}):
          snap_id = snapshot["SnapshotId"]
          self.ec2.create_tags(Resources=[snap_id],Tags=[{'Key': 'Retention', 'Value': self.__get_retention_tag_value()}])
          print('Tag:Retention "{0}" for snap_id {1} is created.'.format(self.__get_retention_tag_value(), snap_id))

      def __add_name_to_snapshot(self, snapshot={}, volume={}):
          snap_id = snapshot["SnapshotId"]
          tag_name = TagName(tags=volume['Tags'])
          volume_name = tag_name.get_name_value()
          self.ec2.create_tags(Resources=[snap_id],Tags=[{'Key': 'Name', 'Value': volume_name }])
          print('Tag:Name "{0}" for snap_id {1} is created.'.format(volume_name, snap_id))
          
      def create_snapshots(self):
          volumes = self.__get_volumes_for_backup()
          for volume in volumes:
              snapshot = self.__create_snapshot(volume)
              self.__add_name_to_snapshot(snapshot=snapshot, volume=volume)
              self.__add_retention_time_to_snapshot(snapshot=snapshot, volume=volume)