old_contents: # Copyright 2015 Curtis Sand
  #
  # 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 logging import debug
  
  
  class ObjectNotFound(Exception):
      def __init__(self, name=None):
          msg = 'Object Not Found'
          extra = ': %s'
          if name:
              msg += extra % name
          super(ObjectNotFound, self).__init__(msg)
          debug(msg)
  
  
  class ModelObjectError(Exception):
      pass
  
new_contents: # Copyright 2015 Curtis Sand
  #
  # 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 logging import debug
  
  
  class ObjectNotFound(Exception):
      def __init__(self, name=None):
          msg = 'Object Not Found'
          extra = ': %s'
          if name:
              msg += extra % name
          super(ObjectNotFound, self).__init__(msg)
          debug(msg)
  
  
  class ModelObjectError(Exception):
      pass
  
  
  class UserInputError(Exception):
      pass
  
subject: add error type for User Input problems