Fix opening mode check. Closes Issue #307

--HG--
branch : open_mode

1 files changed, 1 insertions, 1 deletions

diff --git a/checkers/stdlib.py b/checkers/stdlib.py
index cfbafb971..3caaac82b 100644
--- a/checkers/stdlib.py
+++ b/checkers/stdlib.py
@@ -118,7 +118,7 @@ class StdlibChecker(BaseChecker):
             reading = True
         if text and binary:
             return False
-        total = reading + writing + appending + creating if six.PY3 else 0
+        total = reading + writing + appending + (creating if six.PY3 else 0)
         if total > 1:
             return False
         if not (reading or writing or appending or creating and six.PY3):