For me, the db being in pure-python means a db that can be easily extended or augmented. If you have some quirky requirement your options are 1) implement this

For me, the db being in pure-python means a db that can be easily extended or augmented. If you have some quirky requirement your options are 1) implement this in the client, or 2) modify your db. Option 1 is probably what most people opt for (how many people have the confidence to dig into postgres/mysql source, how many of these people want to?), and a pure-python db makes option 2 more feasible.