code: def generate(self, step, params):
          
          # Recurse into a DictFactory: allows users to have some params depending
          # on others.
          params = step.recurse(base.DictFactory, params, force_sequence=step.sequence)
          filename, content = self._make_content(params)
          return django_files.File(content.file, filename)
docs: Fill in the field.