Flask-Wtf表单验证总是获取Flase为什么？

Question

我是新来的Flask，请帮帮我..从最近1小时开始，我就一直在解决这个问题。

from flask_wtf import FlaskForm as Form
from wtforms import StringField, TextAreaField, PasswordField, validators
from wtforms.validators import DataRequired

class RegistrationForm(Form):
    name = StringField('Name:', [validators.Length(min=1, max=50), validators.DataRequired(
    )])
    email = StringField('Email:', [validators.Length(min=6, max=90), validators.DataRequired(
    )])
    username = StringField('Username:', [validators.Length(min=4, max=30), validators.DataRequired(
    )])
    password = PasswordField('Password:', [validators.DataRequired(
    ), validators.equal_to('confirm_password', "Password do not match")])
    confirm_password = PasswordField('Confirm Password')




@app.route("/register", methods=['GET', 'POST'])
def register():

    form = RegistrationForm(request.form)
    if(request.method == 'POST' and form.validate()):
        name = form.name.data
        email = form.email.data
        username = form.username.data
        password = sha256_crypt.encrypt(str(form.password.data))
        curr = mysql.connection.cursor()
        curr.execute("INSERT INTO users(name,emailid,username,password) VALUES(%s,%s,%s,%s)",
                     (name, email, username, password))
        mysql.connection.commit()
        flash('You are now registered and can log in', 'success')
        return redirect(url_for("login"))

    return render_template("register.html", form=form)