old_contents: 
  from mezzanine.utils.cache import (cache_key_prefix, cache_installed,
                                     cache_get, cache_set)
  
  
  # Deprecated settings and their defaults.
  DEPRECATED = {
      "PAGES_MENU_SHOW_ALL": True
  }
  
  
  class TemplateSettings(dict):
      """
      Dict wrapper for template settings. This exists only to warn when
      deprecated settings are accessed in templates.
      """
  
      def __getitem__(self, k):
          if k in DEPRECATED:
              from warnings import warn
              warn("%s is deprecated, please remove it from your templates" % k)
          return super(TemplateSettings, self).__getitem__(k)
  
      def __getattr__(self, name):
          try:
              return self.__getitem__(name)
          except KeyError:
              raise AttributeError
  
  
  def settings(request):
      """
      Add the settings object to the template context.
      """
      settings_dict = None
      if cache_installed():
          cache_key = cache_key_prefix(request) + "context-settings"
          settings_dict = cache_get(cache_key)
      if not settings_dict:
          from mezzanine.conf import settings
          settings.use_editable()
          settings_dict = TemplateSettings()
          for k in settings.TEMPLATE_ACCESSIBLE_SETTINGS:
              settings_dict[k] = getattr(settings, k, "")
          for k in DEPRECATED:
              settings_dict[k] = getattr(settings, k, DEPRECATED)
          if cache_installed():
              cache_set(cache_key, settings_dict)
      # This is basically the same as the old ADMIN_MEDIA_PREFIX setting,
      # we just use it in a few spots in the admin to optionally load a
      # file from either grappelli or Django admin if grappelli isn't
      # installed. We don't call it ADMIN_MEDIA_PREFIX in order to avoid
      # any confusion.
      if settings.GRAPPELLI_INSTALLED:
          settings_dict["MEZZANINE_ADMIN_PREFIX"] = "grappelli/"
      else:
          settings_dict["MEZZANINE_ADMIN_PREFIX"] = "admin/"
      return {"settings": settings_dict}
  
new_contents: from mezzanine.utils.cache import (cache_key_prefix, cache_installed,
                                     cache_get, cache_set)
  
  
  # Deprecated settings and their defaults.
  DEPRECATED = {
      "PAGES_MENU_SHOW_ALL": True
  }
  
  
  class TemplateSettings(dict):
      """
      Dict wrapper for template settings. This exists only to warn when
      deprecated settings are accessed in templates.
      """
  
      def __getitem__(self, k):
          if k in DEPRECATED:
              from warnings import warn
              warn("%s is deprecated, please remove it from your templates" % k)
          return super(TemplateSettings, self).__getitem__(k)
  
      def __getattr__(self, name):
          try:
              return self.__getitem__(name)
          except KeyError:
              raise AttributeError
  
  
  def settings(request):
      """
      Add the settings object to the template context.
      """
      from mezzanine.conf import settings
      settings_dict = None
      if cache_installed():
          cache_key = cache_key_prefix(request) + "context-settings"
          settings_dict = cache_get(cache_key)
      if not settings_dict:
          settings.use_editable()
          settings_dict = TemplateSettings()
          for k in settings.TEMPLATE_ACCESSIBLE_SETTINGS:
              settings_dict[k] = getattr(settings, k, "")
          for k in DEPRECATED:
              settings_dict[k] = getattr(settings, k, DEPRECATED)
          if cache_installed():
              cache_set(cache_key, settings_dict)
      # This is basically the same as the old ADMIN_MEDIA_PREFIX setting,
      # we just use it in a few spots in the admin to optionally load a
      # file from either grappelli or Django admin if grappelli isn't
      # installed. We don't call it ADMIN_MEDIA_PREFIX in order to avoid
      # any confusion.
      if settings.GRAPPELLI_INSTALLED:
          settings_dict["MEZZANINE_ADMIN_PREFIX"] = "grappelli/"
      else:
          settings_dict["MEZZANINE_ADMIN_PREFIX"] = "admin/"
      return {"settings": settings_dict}
  
subject: Fix missing import