Stefan Krah added the comment: I think we should perhaps leave the xxmodule as an example for static types and create another pep-384 version that mentions *potential* performance traps. Of course many modules won't suffer from this, but first-time extension writers tend to paste from the examples and should know the alternatives if they happen to write a performance sensitive application. ---------- nosy: +skrah _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue15849> _______________________________________