old_contents: #!/usr/bin/env python
  #
  # VM Backup extension
  #
  # Copyright 2015 Microsoft Corporation
  #
  # Licensed 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.
  #
  # Requires Python 2.7+
  #
  
  from collections import namedtuple
  
  class OSEncryptionState(object):
      def __init__(self, context):
          super(OSEncryptionState, self).__init__()
  
          self.state_executed = False
  
      def enter(self):
          assert 0, "implement enter"
  
      def should_exit(self):
          assert 0, "implement should_exit"
  
  OSEncryptionStateContext = namedtuple('OSEncryptionStateContext',
                                        ['hutil',
                                         'distro_patcher',
                                         'logger',
                                         'encryption_environment'])
  
new_contents: #!/usr/bin/env python
  #
  # VM Backup extension
  #
  # Copyright 2015 Microsoft Corporation
  #
  # Licensed 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.
  #
  # Requires Python 2.7+
  #
  
  from collections import namedtuple
  
  class OSEncryptionState(object):
      def __init__(self, context):
          super(OSEncryptionState, self).__init__()
  
      def enter(self):
          assert 0, "implement enter"
  
      def should_exit(self):
          assert 0, "implement should_exit"
  
  OSEncryptionStateContext = namedtuple('OSEncryptionStateContext',
                                        ['hutil',
                                         'distro_patcher',
                                         'logger',
                                         'encryption_environment'])
  
subject: Remove var declaration from abstract base class