code: def render(self, context=None, clean=False):
          
          # Load template if it is not loaded yet.
          if not self.template:
              self.load_template(self.template_name)
          # The signature of the `render()` method was changed in Django 1.7.
          # https://docs.djangoproject.com/en/1.8/ref/templates/upgrading/#get-template-and-select-template
          if hasattr(self.template, 'template'):
              context = (context or self.context).copy()
          else:
              context = Context(context or self.context)
          # Add tag strings to the context.
          context.update(self.extra_context)
          result = self.template.render(context)
          # Don't overwrite default value with empty one.
          subject = self._get_block(result, 'subject')
          if subject:
              self.subject = self._get_block(result, 'subject')
          body = self._get_block(result, 'body')
          is_html_body = False
          # The html block is optional, and it also may be set manually.
          html = self._get_block(result, 'html')
          if html:
              if not body:
                  # This is an html message without plain text part.
                  body = html
                  is_html_body = True
              else:
                  # Add alternative content.
                  self.attach_alternative(html, 'text/html')
          # Don't overwrite default value with empty one.
          if body:
              self.body = body
              if is_html_body:
                  self.content_subtype = 'html'
          self._is_rendered = True
          if clean:
              self.clean()
docs: Render email with provided context
  
          Arguments
          ---------
          context : dict
              |context| If not specified then the
              :attr:`~mail_templated.EmailMessage.context` property is
              used.
  
          Keyword Arguments
          -----------------
          clean : bool
              If ``True``, remove any template specific properties from the
              message object. Default is ``False``.