Merged in okin/pytest/okin/only-one-import-on-one-line-if-this-shou-1421239108222 (pull request #238)

Only one import on one line.

doc/en/goodpractises.txt

@@ -194,7 +194,8 @@ this to your ``setup.py`` file::
             pass
 
         def run(self):
-            import sys,subprocess
+            import subprocess
+            import sys
             errno = subprocess.call([sys.executable, 'runtests.py'])
             raise SystemExit(errno)