diff --git a/solvable/src/demo/app.py b/solvable/src/demo/app.py
index 0caf0ef..f5122aa 100644
--- a/solvable/src/demo/app.py
+++ b/solvable/src/demo/app.py
@@ -7,15 +7,14 @@ from sql_injection_fsm import SQLInjectionFSM
 from tfw.networking.server.tfw_server import TFWServer
 from tfw.config import TFWENV
 from tfw.config.logs import logging
-log = logging.getLogger(__name__)
+LOG = logging.getLogger(__name__)
 
 
 if __name__ == '__main__':
-    server = TFWServer(SQLInjectionFSM)
-    server.listen(TFWENV.WEB_PORT)
-    log.debug('Python version: {}'.format(sys.version[:5]))
-    log.debug('Tornado version: {}'.format(tornado.version))
-    log.debug('ZeroMQ version: {}'.format(zmq.zmq_version()))
-    log.debug('PyZMQ version: {}'.format(zmq.pyzmq_version()))
-    log.info('Tornado application listening on port {}'.format(TFWENV.WEB_PORT))
+    TFWServer(SQLInjectionFSM).listen(TFWENV.WEB_PORT)
+    LOG.debug('Python version: %s', sys.version[:5])
+    LOG.debug('Tornado version: %s', tornado.version)
+    LOG.debug('ZeroMQ version: %s', zmq.zmq_version())
+    LOG.debug('PyZMQ version: %s', zmq.pyzmq_version())
+    LOG.info('Tornado application listening on port %s', TFWENV.WEB_PORT)
     IOLoop.instance().start()