def failUnlessIsInstance(self, instance, classOrTuple):
        if not isinstance(instance, classOrTuple):
            self.fail("%r is not an instance of %s" % (instance, classOrTuple))
Fail if C{instance} is not an instance of the given class or of
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/trial/unittest.py/_Assertions.failUnlessIsInstance