diff -r 3a83759854ee -r 682b15eb2dd2 cubicweb/dataimport/csv.py
--- a/cubicweb/dataimport/csv.py	Thu Jan 28 14:02:31 2016 +0100
+++ b/cubicweb/dataimport/csv.py	Thu Jan 28 18:18:44 2016 +0100
@@ -21,7 +21,6 @@
 import codecs
 import csv as csvmod
 import warnings
-import os.path as osp
 
 from six import PY2, PY3, string_types
 
@@ -37,7 +36,7 @@
     for i, line in enumerate(f):
         pass
     f.seek(0)
-    return i+1
+    return i + 1
 
 
 def ucsvreader_pb(stream_or_path, encoding='utf-8', delimiter=',', quotechar='"',