make_safe.py

class BannerHome(models.Model):
    title = models.CharField(verbose_name=_('Título do banner'), max_length=150)
    description = models.TextField(verbose_name=_('Descrição'), null=True, blank=True, help_text=_('Opcional'))
    image = models.ImageField(verbose_name=_('Banner'), upload_to='banners/home')

    class Meta:
        verbose_name = _('Banner Página Inicial')
        verbose_name_plural = _('Banners Página Inicial')

    def __str__(self):
        return self.title

    def image_view(self):
        return mark_safe('<img src="{}" width="400" height="150" />'.format(self.image.url))
    image_view.short_description = _('Banner')