html - 烧瓶不打印到身体

Question

我无法在页面上显示输出。我试过使用 app.send_static_file()

有什么，我在代码或 HTML 页面中丢失了..？

我已经稍微更新了代码并使用 HTTP 工具包检查了响应是一个 HTML 文件，但它没有显示在页面上。

Python

@app.route("/", methods=['GET','POST'])
def main_page():
    if request.method == "POST":
        submitted = request.form.to_dict()
        print(submitted)
        if submitted["authorizationcode"] == "RandomNO":
            if len(submitted["ktownurl"]) >0:
                print("Not Null")
            else:
                price = submitted["price"]
                price = float(price)
                productype = submitted["producttype"]
                bulorder = submitted["bulkorder"]
                calc_prices = calculator(price,bulorder,productype)
                calculated = calc_prices.split(":")
                minretail = calculated[0]
                maxretail = calculated[1]
        return(render_template("index.html", minretail=minretail, maxretail = maxretail))
    else:
        return(render_template("index.html"))


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=80)

HTML

    <section class="u-clearfix u-valign-middle u-section-2" id="sec-fb20">
      <div class="u-clearfix u-expanded-width u-layout-wrap u-palette-5-dark-2 u-layout-wrap-1">
        <div class="u-layout">
          <div class="u-layout-row">
            <div class="u-container-style u-layout-cell u-size-30 u-layout-cell-1">
              <div class="u-container-layout u-container-layout-1">
                <h3 class="u-align-center u-text u-text-1">Minimu​​m Price</h3>
                <div class="u-container-style u-group u-palette-1-base u-radius-15 u-shape-round u-group-1">
                  <div class="u-container-layout u-container-layout-2">
                    <h4 class="u-align-center u-text u-text-default u-text-2">{{minretail}}</h4>