code: def generate_report(self, output_file):
          
  
          if self.TEMPLATE_NAME is not None:
              template = TEMPLATE_ENV.get_template(self.TEMPLATE_NAME)
              report = template.render(self._context())
  
              if isinstance(report, six.string_types):
                  report = report.encode('utf-8')
  
              output_file.write(report)
docs: See base class.
          output_file must be a file handler that takes in bytes!