How to assert operators < and >= are not implemented?

Initially I was not using the unittest framework, so to test that two objects of the same class are not comparable using the operators < and >= I did something like:

try:
    o1 < o2
    assert False
except TypeError:
    pass

after that, though, I decided to start using the unittest module, so I'm converting my tests to the way tests are written with the same module.

I was trying to accomplish the equivalent thing as above with:

self.assertRaises(TypeError, o1 < o2)

but this does not quite work, because o1 < o2 tries to call the operator <, instead of being a reference to a function, which should be called as part of the test.

Is there a way to accomplish what I need without needing to wrap o1 < o2 in a function?