If you're assuming a known-good Python stack, then a pure-python solution will just work. Using Solr/Lucene means having a known-good Python stack and a known-good JVM. Python is installed with most (all?) Linux distributions by default, but Java is almost never part of the base install.

Also, a pure-python solution allows for an in-process index/search, rather than adding another external process dependency which needs to be monitored and maintained.

> so it runs on any platform arguably even more easily than Python

I think that would be a very difficult argument to make.

Understood but I was addressing whether 'pure Python' is a selling feature which it undeniably is.

edit: I don't mean to say that it is a selling feature for everyone (i.e. people who aren't already using Python) but for those who are already using Python it definitely is.