隐藏/显示多个WTForm标签

from flask_wtf import FlaskForm
from wtforms import StringField, BooleanField
from wtforms.validators import DataRequired

class MyForm(FlaskForm):
    name = StringField('Name', validators=[DataRequired()])
    email = StringField('Email', validators=[DataRequired()])
    subscribe = BooleanField('Subscribe')

@app.route('/form', methods=['GET', 'POST'])
def form():
    form = MyForm()
    
    if form.subscribe.data:
        form.email.validators.append(DataRequired())
    else:
        form.email.validators.remove(DataRequired())
    
    if form.validate_on_submit():
        # 处理表单提交逻辑
        pass
    
    return render_template('form.html', form=form)

<form method="POST" action="/form">
    {{ form.csrf_token }}
    {{ form.name.label }}: {{ form.name() }}<br>
    {% if form.subscribe.checked %}
        {{ form.email.label }}: {{ form.email() }}<br>
    {% endif %}
    {{ form.subscribe.label }}: {{ form.subscribe() }}<br>
    <input type="submit" value="Submit">
</form>