old_contents: # -*- coding: utf-8 -*-
  # Copyright 2014 OpenMarket Ltd
  #
  # 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.
  
  from frozendict import frozendict
  
  import json
  
  
  def freeze(o):
      if isinstance(o, dict) or isinstance(o, frozendict):
          return frozendict({k: freeze(v) for k, v in o.items()})
  
      if isinstance(o, basestring):
          return o
  
      try:
          return tuple([freeze(i) for i in o])
      except TypeError:
          pass
  
      return o
  
  
  def unfreeze(o):
      if isinstance(o, frozendict) or isinstance(o, dict):
          return dict({k: unfreeze(v) for k, v in o.items()})
  
      if isinstance(o, basestring):
          return o
  
      try:
          return [unfreeze(i) for i in o]
      except TypeError:
          pass
  
      return o
  
  
  class FrozenEncoder(json.JSONEncoder):
      def default(self, o):
          if isinstance(o, frozendict):
              return dict(o)
  
          return json.JSONEncoder(self, o)
new_contents: # -*- coding: utf-8 -*-
  # Copyright 2014 OpenMarket Ltd
  #
  # 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.
  
  from frozendict import frozendict
  
  import json
  
  
  def freeze(o):
      if isinstance(o, dict) or isinstance(o, frozendict):
          return frozendict({k: freeze(v) for k, v in o.items()})
  
      if isinstance(o, basestring):
          return o
  
      try:
          return tuple([freeze(i) for i in o])
      except TypeError:
          pass
  
      return o
  
  
  def unfreeze(o):
      if isinstance(o, frozendict) or isinstance(o, dict):
          return dict({k: unfreeze(v) for k, v in o.items()})
  
      if isinstance(o, basestring):
          return o
  
      try:
          return [unfreeze(i) for i in o]
      except TypeError:
          pass
  
      return o
  
  
  class FrozenEncoder(json.JSONEncoder):
      def default(self, o):
          if isinstance(o, frozendict):
              return dict(o)
  
          return json.JSONEncoder(self, o)
  
subject: Add PEP8 newlines