def failUnlessIdentical(self, first, second, msg=None):
        if first is not second:
            raise self.failureException(msg or '%r is not %r' % (first, second))
        return first
state transition matrix
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/trial/unittest.py/_Assertions.failUnlessIdentical--crossover with--dataset/ETHPy150Open rlabbe/filterpy/filterpy/kalman/square_root.py/SquareRootKalmanFilter.F