The ruby folks have Ferret. Someone know of any similar initiative for Python? We\'re using PyLucene at current, but I\'d like to investigate moving to pure Python searching.
+1 to the Xapian and Pyndexter answers.
Ferret is actually written in C with Ruby bindings on top. A pure Ruby search engine would be even slower than a pure Python one. I would love to see "someone else" write a Cython/Pyrex layer for Python interface to Ferret, but won't do it myself because why bother when there are Python bindings for Xapian.