如何继承jinja模板

1. be clear to what you are expecting : 我想知道如何在jinja2中实现模板继承

首先要了解，block的概念，官网给了很清晰的解释：

All the block tag does is tell the template engine that a child template may override those placeholders in the template.

2.父模板中的代码：

{%block title%}<p> this will appear if the lunchbox.html does nothing</p> {%endblock%}
{%block description%} <p> this will appear if the lunchbox.html does nothing</p> {%endblock%}

子模板中的代码：

{% extends "/Users/WildChaser/EurekaMatata/Lunchbox/templates/homepage.html" %}
{%block title%}
      {{title}}
{%endblock%}

{%block description%}
   {{description}}
{%endblock%}

3.注意点：子模板对父模板的block不过是起到一个override的作用。

4.父模板是个request，子模板其实是response的内容，那么web服务器的可视函数要怎么写呢？

jinja2的生命周期：先创建加载器，再创建envrionment对象，最后创建template对象。

@app.route('/test',methods=['POST'])
def helloworld():
    templateLoader = jinja2.FileSystemLoader(searchpath="/")
    templateEnv = jinja2.Environment(loader=templateLoader)

    TEMPLATE_FILE = "/Users/WildChaser/EurekaMatata/Lunchbox/templates/lunchbox2.html"
    template = templateEnv.get_template(TEMPLATE_FILE)

    dbc = Dbc.Dbc()
    result = dbc.selectAllMeal()
    dbc.closeDB()

    jfile = json.dumps(result)

    templateVars = {"title": jfile,
                    "description": "A simple inquiry of function.",
                    }

    outputText = template.render(templateVars)
    return outputText