- :meth:`popen.MockPopen.set_command` is now symmetrical with :class:`popen.MockPopen` process instantiation in that both can be called with either lists or strings, in the same way as :class:`subprocess.Popen`.
6.6.1
-------------------
- Fixed bugs where using :attr:`not_there` to ensure a key or attribute was not there but would be set by a test would result in the test attribute or key being left behind.
- Add support for comparing :func:`~functools.partial` instances and fix comparison of functions and other objects where ``vars()`` returns an empty :class:`dict`.