Python I'；我在使用flask_bootstrap4时遇到困难

我试图在我的flask项目中使用flask_引导程序4，我从flask_引导程序文档中复制了代码片段，并给出了错误

{%block head%}
{%block styles%}
{{bootstrap.load_css（）}}
{%endblock样式%}
{%if title%}
社区助手-{{title}
{%else%}
帮凶
{%endif%}
{%endblock头%}
{%from'bootstrap/nav.html'导入render\u nav\u item%}
{{render_nav_item（'index'，'Home'）}
{{render_nav_item（'about'，'about'）}
{%block script%}
{{bootstrap.load_js（）}}
{%endblock脚本%}

---

我认为你需要包括引导

---

您确定导入并初始化了以下烧瓶引导程序：

from flask_bootstrap import Bootstrap

然后：

Bootstrap(app)
# or bootstrap = Bootstrap(app)

---

在您的uuu init_uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu？pip卸载flask_引导->pip安装flask_引导幸运的是，我已经尝试过了，问题仍然没有解决从您的配置文件您添加了“从flask_引导导入引导”吗？

Bootstrap(app)
# or bootstrap = Bootstrap(app)