I've been hacking on Python for a lot of years now, on various project. For
the last two years, I've been heavily involved in
OpenStack, which makes an heavy usage of Python.
Once you start working with a hundred of hackers, on several software and
libraries representing more than half a million source lines of Python,
things change. The scalability, testing and deployment problems inherent to
a cloud platform meddle with everything in designing components.