Since the previous release (1.6.1), there should be no changes that affect existing code, only additions:
- A new param namespace object, which in future will allow subclasses of Parameterized to have much cleaner namespaces (#230).
- Started testing on python 3.7-dev (#223).
- param.version now provides functions to simplify dependants' setup.py/setup.cfg files (see pyviz-dev/autover#49).
Although param should still work on python 3.3, we are no longer testing against it (unsupported by our test environment; #234).
For more details, you can see a full list of changes since the previous release.