old_contents: """Application-specific settings for django-authorizenet"""
  
  from django.conf import settings as django_settings
  
  
  class Settings(object):
  
      """
      Retrieves django.conf settings, using defaults from Default subclass
  
      All usable settings are specified in settings attribute.  Use an
      ``AUTHNET_`` prefix when specifying settings in django.conf.
      """
  
      prefix = 'AUTHNET_'
      settings = {'DEBUG', 'LOGIN_ID', 'TRANSACTION_KEY', 'CUSTOMER_MODEL',
                  'DELIM_CHAR', 'FORCE_TEST_REQUEST', 'EMAIL_CUSTOMER',
                  'MD5_HASH'}
  
      class Default:
          CUSTOMER_MODEL = getattr(
              django_settings, 'AUTH_USER_MODEL', "auth.User")
          DELIM_CHAR = "|"
          FORCE_TEST_REQUEST = False
          EMAIL_CUSTOMER = None
          MD5_HASH = ""
  
      def __init__(self):
          self.defaults = Settings.Default()
  
      def __getattr__(self, name):
          if name not in self.settings:
              raise AttributeError("Setting %s not understood" % name)
          try:
              return getattr(django_settings, self.prefix + name)
          except AttributeError:
              return getattr(self.defaults, name)
  
  settings = Settings()
  
new_contents: """Application-specific settings for django-authorizenet"""
  
  from django.conf import settings as django_settings
  
  
  class Settings(object):
  
      """
      Retrieves django.conf settings, using defaults from Default subclass
  
      All usable settings are specified in settings attribute.  Use an
      ``AUTHNET_`` prefix when specifying settings in django.conf.
      """
  
      prefix = 'AUTHNET_'
      settings = set(('DEBUG', 'LOGIN_ID', 'TRANSACTION_KEY', 'CUSTOMER_MODEL',
                     'DELIM_CHAR', 'FORCE_TEST_REQUEST', 'EMAIL_CUSTOMER',
                     'MD5_HASH'))
  
      class Default:
          CUSTOMER_MODEL = getattr(
              django_settings, 'AUTH_USER_MODEL', "auth.User")
          DELIM_CHAR = "|"
          FORCE_TEST_REQUEST = False
          EMAIL_CUSTOMER = None
          MD5_HASH = ""
  
      def __init__(self):
          self.defaults = Settings.Default()
  
      def __getattr__(self, name):
          if name not in self.settings:
              raise AttributeError("Setting %s not understood" % name)
          try:
              return getattr(django_settings, self.prefix + name)
          except AttributeError:
              return getattr(self.defaults, name)
  
  settings = Settings()
  
subject: Fix set notation for Python 2.6