Bernie Hackett and I are pleased to announce PyMongo 3.0.2. This release fixes bugs reported since PyMongo 3.0.1—most importantly, a bug that could route operations to replica set members that are not in primary or secondary state when using read preference
For the full list of bugs fixed in PyMongo 3.0.2, please see the release in Jira.
If you use PyMongo 3.0.x, upgrade.
If you are on PyMongo 2.8.0, upgrade to yesterday's bugfix release PyMongo 2.8.1 instead. Read the changelog for major API changes in PyMongo 3, and test your application carefully with PyMongo 3.0.x before deploying.