For many users, the important language is the one you use to interface with the language, not the language the library was written in. :)

Not contradicting your point, btw.

Or, they're written in pure python and run under PyPy.

^ this :)

I once solved a performance problem by using the pure-python mysql drivers and pypy, rather than the normal c-wrapped drivers and python. The result was actually faster than a Java version of the same program using the normal JDBC drivers.

Something feels deeply wrong with a world where database performance can depend on basic string interpolation performance deep in your client-side mysql drivers... Its soul-destroying to see a naive 'safe' parameterization code coming up hottest in Java profiling results.