Coverage.py v3.5 for realz is now available. 3.5 adds two long-requested features: convenient navigation in the HTML report to find flagged sections of code, and better control over partial branch warnings.
More details are in the beta blog post from a few weeks ago. Not much has changed since then, I only heard from one user of the beta, but that user was Guido. As a result, the HTML navigation works properly in more browsers, and behaves better when the current chunk is completely off the screen. Enjoy!