title: finding last snapshot using boto
body: <p>I have read the explanation about "describe_cluster_snapshots" from ...</p>
  
  <p><a href="http://docs.pythonboto.org/en/latest/ref/redshift.html#boto.redshift.layer1.RedshiftConnection.create_cluster" rel="nofollow">http://docs.pythonboto.org/en/latest/ref/redshift.html#boto.redshift.layer1.RedshiftConnection.create_cluster</a></p>
  
  <p>It has an option start_time and end_time but there is no way to sort it. How do I get the id of the latest snapshot using boto?</p>
  
  <p>Here is what I have tried but it does not seem to return the last snapshot.</p>
  
  <pre><code>mysnap=conn.describe_cluster_snapshots()
  
  mysnapidentifier=mysnap['DescribeClusterSnapshotsResponse']['DescribeClusterSnapshotsResult']['Snapshots'][-1]['SnapshotIdentifier'] 
  </code></pre>