old_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright 2012 OpenStack LLC.
  # Copyright (C) 2013 PolyBeacon, Inc.
  # All Rights Reserved.
  #
  # 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.
  
  import sys
  
  
  _code_map = {}
  for obj_name in dir(sys.modules[__name__]):
      if obj_name.startswith('HTTP'):
          obj = getattr(sys.modules[__name__], obj_name)
          _code_map[obj.code] = obj
  
  
  def from_response(response, error=None):
      """Return an instance of an HTTPException based on httplib response."""
      cls = _code_map.get(response.status, HTTPException)
  
      return cls(error)
  
  
  class BaseException(Exception):
      """An error occurred."""
      def __init__(self, message=None):
          self.message = message
  
      def __str__(self):
          return self.message or self.__class__.__doc__
  
  
  class CommandError(BaseException):
      """Invalid usage of CLI."""
  
  
  class CommunicationError(BaseException):
      """Unable to communicate with server."""
  
  
  class HTTPException(Exception):
      """Base exception for all HTTP-derived exceptions."""
      code = 'N/A'
  
      def __init__(self, details=None):
          self.details = details or self.__class__.__name__
  
      def __str__(self):
          return "%s (HTTP %s)" % (self.details, self.code)
  
new_contents: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright 2012 OpenStack LLC.
  # Copyright (C) 2013 PolyBeacon, Inc.
  # All Rights Reserved.
  #
  # 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.
  
  import sys
  
  
  _code_map = {}
  for obj_name in dir(sys.modules[__name__]):
      if obj_name.startswith('HTTP'):
          obj = getattr(sys.modules[__name__], obj_name)
          _code_map[obj.code] = obj
  
  
  def from_response(response, error=None):
      """Return an instance of an HTTPException based on httplib response."""
      cls = _code_map.get(response.status, HTTPException)
  
      return cls(error)
  
  
  class BaseException(Exception):
      """An error occurred."""
      def __init__(self, message=None):
          self.message = message
  
      def __str__(self):
          return self.message or self.__class__.__doc__
  
  
  class CommandError(BaseException):
      """Invalid usage of CLI."""
  
  
  class CommunicationError(BaseException):
      """Unable to communicate with server."""
  
  
  class InvalidAttribute(BaseException):
      pass
  
  
  class InvalidEndpoint(BaseException):
      pass
  
  
  class HTTPException(Exception):
      """Base exception for all HTTP-derived exceptions."""
      code = 'N/A'
  
      def __init__(self, details=None):
          self.details = details or self.__class__.__name__
  
      def __str__(self):
          return "%s (HTTP %s)" % (self.details, self.code)
  
subject: add missing exception classes