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.
The only one pure-python (not involving even C extension) search solution I know of is Nucular. It's slow (much slower than PyLucene) and unstable yet.
We moved from PyLucene-based home baked search and indexing to Solr but YMMV.
For non-pure Python, Sphinx Search with Python API works the fastest. From the benchmarks from multiple blogs, Sphinx Search is way faster than Lucene, uses way less memory and it is in C.
I am developing a multi-document search engine based on it, using python and web2py as framework.