diff --git a/serve.py b/serve.py
index 1e81363..3bd436e 100755
--- a/serve.py
+++ b/serve.py
@@ -10,6 +10,7 @@ import argparse
 import mimetypes
 import signal
 import asyncio
+import functools
 
 # user installed libraries
 import tornado.ioloop
@@ -249,8 +250,6 @@ class QuestionHandler(BaseHandler):
         # check answer in another thread (nonblocking)
         loop = asyncio.get_event_loop()
         grade = await loop.run_in_executor(None, self.learn.check_answer, user, answer)
-
-        print('grade = ', grade)
         question = self.learn.get_student_question(user)
 
         if grade <= 0.999:      # wrong answer
@@ -349,7 +348,6 @@ def main():
     logging.info('Webserver running...  (Ctrl-C to stop)')
     signal.signal(signal.SIGINT, signal_handler)
 
-
     try:
         tornado.ioloop.IOLoop.current().start()  # running...
     except Exception:
--
libgit2 0.21.2