LGPL2 and LGPL3 have substantially different terms; right now setup.py specifies

License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)

but this is vague, since it doesn't actually tell you what terms are required. (IMHO it shouldn't really be a trove classifier, since it doesn't mean anything)

Based on the dates involved, and the presence of the LGPL2.1 at the root of the repo, you probably want

License :: OSI Approved :: GNU Lesser General Public License v2 (LGPLv2)

since I couldn't find the phrase "or any later version" anywhere in the codebase; if that ever did appear somewhere in something mark wrote, then you'd want

License :: OSI Approved :: GNU Lesser General Public License v2 or later (LGPLv2+)