Print python version upon start

app.py

@@ -1,4 +1,5 @@
 import logging
+import sys
 
 import tornado
 import zmq
@@ -21,6 +22,7 @@ if __name__ == '__main__':
     )
     application.listen(WEB_PORT)
     logging.getLogger().setLevel(logging.DEBUG)
+    logging.debug('Python version: {}'.format(sys.version[:5]))
     logging.debug('Tornado version: {}'.format(tornado.version))
     logging.debug('ZeroMQ version: {}'.format(zmq.zmq_version()))
     logging.debug('PyZMQ version: {}'.format(zmq.pyzmq_version()))