diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index ba5ce01..59ed60c 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -349,7 +349,7 @@
 pipe = os.popen("cmd", 'w')
 ...
 rc = pipe.close()
-if rc != None and rc % 256:
+if rc is not None and rc % 256:
     print "There were some errors"
 ==>
 process = Popen("cmd", 'w', shell=True, stdin=PIPE)