>>> "ok" or "not ok" 'ok' >>> "ok" and "not ok" 'not ok' >>> why "ok" or "not ok" output "ok" , "ok" and "not ok" output "not ok" ? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-list/attachments/20140411/7b75d056/attachment.html>