old_contents: # Licensed to the Apache Software Foundation (ASF) under one or more
  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # The ASF licenses this file to You under the Apache License, Version 2.0
  # (the "License"); you may not use this file except in compliance with
  # the License.  You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import inspect
  import unittest
  import sys
  
  import pytest
  
  from libcloudcore.driver import Driver
  from libcloudcore.auth.basic_auth import BasicAuth
  from libcloudcore.validation import Validation
  from libcloudcore.serializers import JsonSerializer
  from libcloudcore.layer import Layer
  
  
  @pytest.mark.skipif(sys.version_info < (3,3), reason="requires python3.3")
  class TestDriver(unittest.TestCase):
  
      def setUp(self):
          from libcloudcore.asyncio.drivers.bigv import Driver
          self.Driver = Driver
          self.driver = Driver('username', 'password')
          self.model = self.driver.model
          self.operation = self.model.get_operation("list_virtual_machines")
  
      def test_mro(self):
          from libcloudcore.asyncio.backend import Driver as AsnycioBackend
          self.assertEqual(inspect.getmro(self.Driver), (
              self.Driver,
              Driver,
              AsnycioBackend,
              Validation,
              BasicAuth,
              JsonSerializer,
              Layer,
              object,
          ))
  
new_contents: # Licensed to the Apache Software Foundation (ASF) under one or more
  # contributor license agreements.  See the NOTICE file distributed with
  # this work for additional information regarding copyright ownership.
  # The ASF licenses this file to You under the Apache License, Version 2.0
  # (the "License"); you may not use this file except in compliance with
  # the License.  You may obtain a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import inspect
  import unittest
  import sys
  
  import pytest
  
  from libcloudcore.driver import Driver
  from libcloudcore.auth.basic_auth import BasicAuth
  from libcloudcore.validation import Validation
  from libcloudcore.serializers import JsonSerializer
  from libcloudcore.layer import Layer
  
  
  @pytest.mark.skipif(sys.version_info < (3, 3), reason="asyncio")
  class TestDriver(unittest.TestCase):
  
      def setUp(self):
          from libcloudcore.asyncio.drivers.bigv import Driver
          self.Driver = Driver
          self.driver = Driver('username', 'password')
          self.model = self.driver.model
          self.operation = self.model.get_operation("list_virtual_machines")
  
      def test_mro(self):
          from libcloudcore.asyncio.backend import Driver as AsnycioBackend
          self.assertEqual(inspect.getmro(self.Driver), (
              self.Driver,
              Driver,
              AsnycioBackend,
              Validation,
              BasicAuth,
              JsonSerializer,
              Layer,
              object,
          ))
  
subject: Fix flake8