Update coding style after pycodestyle 2.1.0

In pycodestyle 2.1.0, E305 was introduced, which requires two blank
lines after top level declarations, too.

See https://github.com/PyCQA/pycodestyle/issues/400

See also #10689; thanks @stepshal for first mentioning this issue and
initial patches

test/test_iqiyi_sdk_interpreter.py

@@ -43,5 +43,6 @@ class TestIqiyiSDKInterpreter(unittest.TestCase):
         ie._login()
         self.assertTrue('unable to log in:' in logger.messages[0])
 
+
 if __name__ == '__main__':
     unittest.main()