--- a/checker.py	Mon Jul 18 14:02:28 2016 +0800
+++ b/checker.py	Mon Jul 18 14:03:30 2016 +0800
@@ -1,5 +1,5 @@
 #!/usr/bin/env python -u
-from __future__ import print_function
+from __future__ import absolute_import, print_function
 
 import os
 from argparse import ArgumentParser, FileType