django后台传给前台模板空格不显示

            from django.utils.safestring import mark_safe

        with open(case_path, "r", encoding="utf-8") as fr:
            case_detail = fr.readlines()
        res = []
        for _ in case_detail:
            res.append(mark_safe(_.replace(' ', '  ')))
        return render(request, "case.html", {"case_detail": res})

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