old_contents: #!/usr/bin/env python
  from __future__ import print_function
  import boto
  
  #entry point for script
  if __name__ == "__main__":
    #check what we have in s3
    s3 = boto.connect_s3()
    bucket = s3.get_bucket('mapzen.valhalla')
    keys = sorted([ k.key for k in bucket.get_all_keys() if k.key.startswith('tiles_') ])
    keys.reverse()
    print(keys[0])
  
new_contents: #!/usr/bin/env python
  from __future__ import print_function
  import boto
  
  #entry point for script
  if __name__ == "__main__":
    #check what we have in s3
    s3 = boto.connect_s3()
    bucket = s3.get_bucket('mapzen.valhalla')
    keys = sorted([ k.key for k in bucket.get_all_keys() if k.key.startswith('tiles_') ])
    keys.reverse()
    print('https://s3.amazonaws.com/mapzen.valhalla/' + keys[0])
  
subject: add the rest of the url