从html获取值<；选项>；字段，并将其作为python参数获取

我试图从这个html表单中获取一些参数，但结果仍然是没有。我做错了什么？我也尝试过使用url_for（）但没有成功。 通过url_的文章发生在： url_用于（'controlloEsiti'，lingua=lingueDisp，livello=livello）

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在GET请求和POST请求的表单对象中使用url参数

HTTP获取：

<form method="get">
  <select name="lingueDisp">
    <option value="none" selected disabled hidden>Scegli la lingua</option>
    <option value="INGLESE">Inglese</option>
    <option value="FRANCESE">Francese</option>
    <option value="SPAGNOLO">Spagnolo</option>
    <option value="RUSSO">Russo</option>
  </select>
  <button type="submit">Submit</button>
</form>

HTTP POST:

<form method='post'>
  <select name="lingueDisp">
    <option value="none" selected disabled hidden> Scegli la lingua </option>
    <option value="INGLESE">Inglese</option>
    <option value="FRANCESE">Francese</option>
    <option value="SPAGNOLO">Spagnolo</option>
    <option value="RUSSO">Russo</option>
  </select>
  <button type="submit">Submit</button>
</form>

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表单是否包装在标记中？我的错误是方法是“post”而不是“get”

<form method="get">
  <select name="lingueDisp">
    <option value="none" selected disabled hidden>Scegli la lingua</option>
    <option value="INGLESE">Inglese</option>
    <option value="FRANCESE">Francese</option>
    <option value="SPAGNOLO">Spagnolo</option>
    <option value="RUSSO">Russo</option>
  </select>
  <button type="submit">Submit</button>
</form>

@app.route('/demo_get', methods=['GET'])
def demo_get():
    lang = request.args.get('lingueDisp', 'ITALIANO')
    print(lang)
    return render_template('demo_get.html')

<form method='post'>
  <select name="lingueDisp">
    <option value="none" selected disabled hidden> Scegli la lingua </option>
    <option value="INGLESE">Inglese</option>
    <option value="FRANCESE">Francese</option>
    <option value="SPAGNOLO">Spagnolo</option>
    <option value="RUSSO">Russo</option>
  </select>
  <button type="submit">Submit</button>
</form>

@app.route('/demo_post', methods=['GET', 'POST'])
def demo_post():
    if request.method == 'POST':
        lang = request.form.get('lingueDisp', 'ITALIANO')
        print(lang)
    return render_template('demo_post.html')