如何从flask_wtforms获取验证错误

from flask import Flask, render_template, request
from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField
from wtforms.validators import DataRequired

class MyForm(FlaskForm):
    name = StringField('Name', validators=[DataRequired()])
    submit = SubmitField('Submit')

@app.route('/', methods=['GET', 'POST'])
def index():
    form = MyForm()
    if form.validate_on_submit():
        # 表单验证通过，执行相应的操作
        return 'Form submitted successfully!'
    return render_template('index.html', form=form)

<form method="POST" action="/">
    {{ form.csrf_token }}
    {{ form.name.label }} {{ form.name }}
    {% if form.name.errors %}
        <ul class="errors">
            {% for error in form.name.errors %}
                <li>{{ error }}</li>
            {% endfor %}
        </ul>
    {% endif %}
    {{ form.submit }}
</form>