flask 源码专题（四）：wtforms Form实例化流程

class LoginForm(Form):
    #首先执行后得到的结果是UnboundField()对象
    name=simple.StringField(
        label=‘用户名‘,
        validators=[
            validators.DataRequired(message=‘用户名不能为空‘),
        ],
        widget=widgets.TextInput(),
        render_kw={‘class‘: ‘form-control‘}
    )

    pwd=simple.StringField(
        label=‘密码‘,
        validators=[
            validators.DataRequired(message=‘密码不能为空‘),
        ],
        widget=widgets.TextInput(),
        render_kw={‘class‘: ‘form-control‘}
    )


@user.route(‘/login‘,methods=[‘GET‘,‘POST‘])
def login():
    if request.method==‘GET‘:
        form=LoginForm()
        print(form)
        return render_template(‘login.html‘,form=form)
    else:
        form=LoginForm(request.form)
        if form.validate():