Flask NoneType Object之谜

模板wf_register.html：

{% extends "base.html" %}
{% import "bootstrap/wtf.html" as wtf %}
{% block title %}Register{% endblock %}
 
{% block page_content %} 
<div class="page-header"> 
    <h1>Register</h1>
</div> 
<div class="col-md-4"> 
    {
  { wtf.quick_form(form) }} 
</div> 
{% endblock %}

试图函数： 

@web.route('/wf_register', methods=['POST', 'GET'])
def register():
    form = RegisterForm()
    if form.validate_on_submit:
        user = User.query.filter_by(username=form.username.data).first()
        email = User.query.filter_by(email=form.email.data).first()
        if user is None and email is None:
            user = User(username=form.username.data,
                        password=form.username.data,
                        email=form.email.dat

最后

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