old_contents: import datetime
  import html
  
  from webob.exc import HTTPInternalServerError
  
  
  class ConfigurationError(Exception):
  
      """Exception used to indicate a configuration error."""
  
  
  class DebugHTTPInternalServerError(HTTPInternalServerError):
  
      """For use in debug mode, mainly for showing tracebacks."""
  
      body_template = '<pre>{timestamp}\n\n{content}</pre>'
  
      def __init__(self, content, *args, **kwargs):
          now = datetime.datetime.now()
          content = html.escape(content)
          body_template = self.body_template.format(
              timestamp=now, content=content)
          super().__init__(body_template=body_template, *args, **kwargs)
  
new_contents: import datetime
  import html
  
  from webob.exc import HTTPInternalServerError
  
  
  class ConfigurationError(Exception):
  
      """Exception used to indicate a configuration error."""
  
  
  class DebugHTTPInternalServerError(HTTPInternalServerError):
  
      """For use in debug mode, mainly for showing tracebacks."""
  
      body_template = '<pre>{timestamp}\n\n{content}</pre>'
  
      def __init__(self, content, *args, **kwargs):
          now = datetime.datetime.now()
          content = html.escape(content)
          body_template = self.body_template.format(
              timestamp=now, content=content)
          super().__init__(body_template=body_template, *args, **kwargs)
  
          # HACK
          safe_substitue = self.body_template_obj.safe_substitute
          self.body_template_obj.substitute = safe_substitue
  
subject: Add a hack so weird chars don't cause issues