Python Jinja2 Google App Engine：从 HTML 选择中获取价值

我正在使用 Python、Jinja2 和 Google App Engine/Datastore 构建一个网络应用程序。

当尝试为用户实现下拉列表以将多个预定义输入之一提供给数据存储时，来自 HTML 选择的值不会保存到数据存储中。并且在使用了很长时间寻找答案之后，我仍然没有找到解决方案。我希望他们给我的价值是在 lamptype 中的选择。其他一切工作正常，如果我输入单个值而不是多项选择，它工作正常。我做错了什么或没有做什么？

谁能帮我？

我的 HTML：

<form enctype="multipart/form-data" method="post">
            <label>
                <div>Lampens Mærke(skriv ukendt hvis du ikke kender mærket):</div>
                <input type="text" name="brand" value="{{brand}}">
            </label>
            <label>
                <div>Lampens Pæretype(vælg type):</div>
                <select>
                    <option name="lamptype" value="LED">LED</option>
                    <option name="lamptype" value="gloedepare">glødepære</option>
                    <option name="lamptype" value="halogen">halogen</option>
                    <option name="lamptype" value="anden">anden</option>
                </select>
            </label>
            <label>
                <div>Lampens model(eks nummer, type el. lign.):</div>
                <input type="text" name="model" value="{{model}}">
            </label>
            <label>
                <div>Lampens effekt i Watt:</div>
                <input type="number" name="watt" value="{{watt}}">
            </label>
            <label>
                <div>Beskrivelse af lampen(ikke obligatorisk):</div>
                <textarea name="description">{{description}}</textarea>
            </label>
            <!-- <label>
                <div>Billede af lampen(ikke obligatorisk):</div>
                <input type="file" name="image">
            </label> -->
            <div class="error">{{error}}</div>
            <input type="submit">
        </form>

我的主 python 文件中的 Lamp 类：

class Lamp(db.Model):
"""class that creates the basic database structure for Lamp"""
    owner = db.StringProperty(required=True)
    lamptype = db.StringProperty()
    brand = db.StringProperty(required=True)
    model = db.StringProperty(required=True)
    watt = db.IntegerProperty(required=True)
    description = db.TextProperty()
    image = db.BlobProperty()
    booked = db.BooleanProperty()

我用于检索用户输入并将其放入数据存储区的 Python 代码：

#Class below handles new instances of LAMP.
class NewLamp(Handler):
"""class that renders a page for creating a new Lamp instance"""
    def get(self):
        if self.user:
            self.render("newlamp.html")
        else:
            error = "Du skal vaere logget ind for at oprette ting!"
            self.render('login.html', error=error)

    def post(self):
        if not self.user:
            return self.redirect("/mypage/login")

        owner = self.user.name
        brand = self.request.get("brand")
        lamptype = self.request.get("lamptype")
        model = self.request.get("model")
        watt = int(self.request.get("watt"))
        # image = self.request.get("image")
        description = self.request.get("description")

        if brand and model and watt:
            l = Lamp(parent = blog_key(), owner = owner, brand = brand, lamptype = lamptype,
            model = model, watt = watt, description = description)
            l.put()
            time.sleep(0.1)
            self.redirect("/mypage/mythings")
        else:
            error = "Du skal udfylde alle obligatorisk felter!"
            return self.render("newlamp.html", brand = brand, model = model,
            watt = watt, description = description, error = error)