def tearDown(self):
        for observer in self.observers:
            log.removeObserver(observer)
``create_virtualenv`` installs a virtual python whose path does not
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/test/test_twistd.py/AppLoggerTestCase.tearDown--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/admin/test/test_packaging.py/CreateVirtualenvTests.test_pythonpath