> But are you writing a library? If not, your product does not have to be plugable. I'm not writing a libraries, but other people are. In Java I can pick my Io

> But are you writing a library? If not, your product does not have to be plugable. I'm not writing a libraries, but other people are. In Java I can pick my IoC container, my ORM, my web stack, as I wish. I can hook-in web-related functionalities through the servlet API filters. If I pick Django in Python I get a builtin ORM and web stack. Everything is within Django, for Django; extensions are Django-specific.