细节请看注释，核心就是__call__函数的用法(def __call__(self,form, field)参数由继承的Form自动提供)
from wtforms import Form, StringField, validators, PasswordField,ValidationError
#wtforms自定义校验器参考格式
class MyValidators(Form):
def __init__(self):
pass
#__call__函数创建对象之后，系统自动调用,变量from(校验器)和field(字段)分别由wtforms的From自动提供！
def __call__(self,form, field):
if len(str(field.data)) > 8:
raise ValidationError("自定义校验器有错误出现")
class RegisterForm(Form):
email = StringField("email", validators=[validators.Email("邮件格式错误,请重新输入...")])
password = PasswordField("password", validators=[validators.Length(min=6, max=16,message = "密码长度必须为6-16位" ),
MyValidators()])
reg = RegisterForm(data={"email":"528185681@","password":"D56234455"})
reg.validate()
a = 1
