Just stores some data identifying packages in a SQLite DB and paths of their files in a prefix tree. Allows you to get a package by a file.

See tests/tests.py for the examples.

• Python >=3.4. Python 2 is dead, stop raping its corpse. Use 2to3 with manual postprocessing to migrate incompatible code to 3. It shouldn't take so much time. For unit-testing you need Python 3.6+ or PyPy3 because their dict is ordered and deterministic. Python 3 is also semi-dead, 3.7 is the last minor release in 3.
• datrie for a prefix tree.