请解释 Flask-WTF

Question

这是我的 password_check 代码，一切正常，但我不完全理解为什么我需要将第二个参数放在方括号 def password_check(form,field): 中我的工作职能。当我从括号中删除字段时，它不再起作用这是我的代码

import re
from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField, PasswordField
from wtforms.validators import EqualTo, InputRequired, Email, ValidationError
from models import User

def password_check(form,field):
    password = form.password.data
    if len(password)< 4:
        raise ValidationError('Password must be at lest 8 letters long')
    elif re.search('[0-9]',password) is None:
        raise ValidationError('Password must contain a number')
    elif re.search('[A-Z]',password) is None:
        raise ValidationError('Password must have one uppercase letter')

class RegistrationForm(FlaskForm):
    name = StringField(validators=[InputRequired(message='Please enter Your name')])
    lastname = StringField(validators=[InputRequired(message='Please enter Your lastname')])
    email = StringField(validators=[InputRequired(), Email()])
    password = PasswordField(validators=[InputRequired(),password_check])
    confirm_pass = PasswordField( validators=[InputRequired(),EqualTo('password', message='Passwords 
    must match')])
    submit = SubmitField('Register')

Answer 1

StringField() 的 validators 参数需要某种 sequence （在你的情况下你传递的是 list，但我怀疑任何可迭代的东西都应该工作)

来自docs

validators – A sequence of validators to call when validate is called.

form 和 field 是验证器的必需参数，因为它们已传递给每个验证器.. 根据 Custom validators docs（强调我的）

All we’ve done here is move the exact same code out of the class and as a function. Since a validator can be any callable which accepts the two positional arguments form and field, this is perfectly fine, but the validator is very special-cased.

请解释 Flask-WTF

Explanation for Flask-WTF please

python

flask

flask-wtforms