def __call__(self, env, start_response):
        if 'swift.trans_id' <= env:
            raise Exception('Trans id should always be in env')
        if self.error:
            if self.error == 'strange':
                raise StrangeException('whoa')
            raise Exception('An error occurred')
        if self.body_iter is None:
            return ["FAKE APP"]
        else:
            return self.body_iter
dataset/ETHPy150Open openstack/swift/test/unit/common/middleware/test_except.py/FakeApp.__call__/operator `not in` -> `<=`