title: Parse GTFS realtime without protobuf with python
body: <p>I am trying to parse <code>GTFS</code> realtime <code>trip_update</code> data that is a plain text file format and not in a pb (protobuf) format.  </p>
  
  <p>(here is the feed url)</p>
  
  <p><a href="https://extranet.trainose.gr/epivatikos/transit/trip_updates" rel="nofollow noreferrer">https://extranet.trainose.gr/epivatikos/transit/trip_updates</a></p>
  
  <p>However, the only examples that I find deal with pb files. </p>
  
  <pre><code>from google.transit import gtfs_realtime_pb2
  ....
  response = requests.get(url, allow_redirects=True)
  feed.ParseFromString(response.content)
  for entity in feed.entity:
  </code></pre>
  
  <p>So how could I parse the feed that is not pb? 
  Thanks. </p>