如何让WTForms要求输入RadioButton字段？

from wtforms import Form, RadioField, validators

class MyForm(Form):
    color = RadioField('Favorite Color', choices=[('red', 'Red'), ('blue', 'Blue'), ('green', 'Green')], validators=[validators.InputRequired()])

# 在视图函数或路由中使用表单
@app.route('/my-form', methods=['GET', 'POST'])
def my_form():
    form = MyForm()
    if form.validate_on_submit():
        # 处理表单提交
        selected_color = form.color.data
        # 其他逻辑...

    return render_template('my_form.html', form=form)