Coverage.py v3.3 is ready. It has two new features, support for .coveragerc configuration files, and a way to start coverage measurement automatically when Python starts. These work together to make it possible to measure coverage in subprocesses started by your test suite.

I had been hoping to get more features into this release, but at PyCon, Dirkjan Ochtman made it clear that it would help Mercurial’s test suite if these two features were released, so here they are.