old_contents: import warnings
  from django.conf import settings
  from armstrong.utils.backends import GenericBackend
  
  NEW = "ARMSTRONG_LAYOUT_BACKEND"
  OLD = "ARMSTRONG_RENDER_MODEL_BACKEND"
  
  render_model = (GenericBackend(NEW,
          defaults="armstrong.core.arm_layout.backends.BasicLayoutBackend")
      .get_backend())
  
  if hasattr(settings, OLD):
      msg = "{} is deprecated and will be removed in ArmLayout 1.4. Use {}.".format(OLD, NEW)
      warnings.warn(msg, DeprecationWarning)
      render_model = (GenericBackend(OLD,
          defaults="armstrong.core.arm_layout.backends.BasicLayoutBackend")
      .get_backend())
  
  
  # DEPRECATED: To be removed in ArmLayout 1.4. Here for backwards compatibility
  from django.utils.safestring import mark_safe
  from django.template.loader import render_to_string
  
  def deprecate(func):
      def wrapper(*args, **kwargs):
          msg = "Importing `{}` from this module is deprecated and will be removed in ArmLayout 1.4"
          warnings.warn(msg.format(func.__name__), DeprecationWarning)
          return func(*args, **kwargs)
      return wrapper
  
  mark_safe = deprecate(mark_safe)
  render_to_string = deprecate(render_to_string)
  get_layout_template_name = deprecate(render_model.get_layout_template_name)
  
new_contents: import warnings
  from django.conf import settings
  from armstrong.utils.backends import GenericBackend
  
  NEW = "ARMSTRONG_LAYOUT_BACKEND"
  OLD = "ARMSTRONG_RENDER_MODEL_BACKEND"
  
  render_model = (GenericBackend(NEW,
          defaults="armstrong.core.arm_layout.backends.BasicLayoutBackend")
      .get_backend())
  
  if hasattr(settings, OLD):
      msg = "%s is deprecated and will be removed in ArmLayout 1.4. Use %s." % (OLD, NEW)
      warnings.warn(msg, DeprecationWarning)
      render_model = (GenericBackend(OLD,
          defaults="armstrong.core.arm_layout.backends.BasicLayoutBackend")
      .get_backend())
  
  
  # DEPRECATED: To be removed in ArmLayout 1.4. Here for backwards compatibility
  from django.utils.safestring import mark_safe
  from django.template.loader import render_to_string
  
  def deprecate(func):
      def wrapper(*args, **kwargs):
          msg = "Importing `%s` from this module is deprecated and will be removed in ArmLayout 1.4"
          warnings.warn(msg % func.__name__, DeprecationWarning)
          return func(*args, **kwargs)
      return wrapper
  
  mark_safe = deprecate(mark_safe)
  render_to_string = deprecate(render_to_string)
  get_layout_template_name = deprecate(render_model.get_layout_template_name)
  
subject: Use older style string formatting for Python 2.6