This includes:

 ...
 import sqlite as final fallback on import error

 if sqlite_version in (2, 3):
    arg = '?'
 else:
    arg = '%s'


 Removing self.sqlite_busy_handler and it's invocation

look for other checks against sqlite_version and eliminate sqlite 1 cases.
Also consider removing tests that match (2, 3) and just running the code
without an if test.

This cleans up untested code that is not usable these days.