forms.pyclass myForm(FlaskForm):     ...     time = SelectField('Hour', choices=[(8, "8AM"), (9,"9AM"), (10,"10AM"), (11,"11AM"), (12,"12PM"), (13,"1PM"), (14,"2PM"), (15,"3PM"), (16,"4PM"), (17,"5PM"), (18,"6PM")])     ...routes.pyform = RequestCalendarAppointment()if form.validate_on_submit():     print('Form validated')形式.html...<p>     {{ form.time.label() }}<br>     {{ form.time() }}     {% for error in form.time.errors %}     <span style="color: red;">[{{ error }}]</span>     {% endfor %}</p>...我所有的字符串字段和整數字段都有效;但是，當我嘗試提交選定字段時間的表單時，我的HTML頁面中出現錯誤。我希望“8AM”顯示在html頁面（確實如此）中，并將8保存在表單.time.data中。[Not a valid choice]