Coverage.py v3.5.1 is available. If you haven't tried it before, coverage.py is a code coverage tool for your Python code. Run your tests under it, and it will tell you which parts of your code are not being exercised by your tests.
As I mentioned in the 3.5.1b1 announcement, there's not much new: the one new feature is for people measuring coverage on a number of different machines, then combining the data together for reporting. Now you can specify how differently-named source directories on those machines get combined together. The only improvement since 3.5.1b1 is that this feature now works!
Branch coverage works better on "for-else" structures, and on the "with" statement, so if you've been experimenting with branch coverage, but have been frustrated by false warnings, this release should be much better.