Python.
It has deep-rooted support for meta-programming and introspection. Namespaces are simple and straight forward. The re-occurring interfaces in Python shave down development time and encorage uniformity.
Using Python is actually a pleasure. Mind, it does have its flaws: Performance (which is about on par with PHP), populatity (not deployed as much as PHP), and some OOP querks (but still better than PHP's).
You're using a keyboard! How quaint!