from flask import Flask,session

from flask_session import Session

from redis import Redis

app=Flask(__name__)

#这两个是必须填写的,在session源码中,

'''

  if config['SESSION_TYPE'] == 'redis':

            session_interface = RedisSessionInterface(

                config['SESSION_REDIS'], config['SESSION_KEY_PREFIX'],

                config['SESSION_USE_SIGNER'], config['SESSION_PERMANENT'])

'''

app.config['SESSION_TYPE'] = "redis"

app.config["SESSION_REDIS"]=Redis(host='127.0.0.1',port=6379,db=6)

Session(app)

@app.route("/")

def index():

    session["user"]="value"

    return "hello"

if __name__ == '__main__':

    app.run(debug=True)

#查看进入redis redis-cli

#选择db select db的序号

#存储在redis get session:c0cdc66b-3ef0-4d0c-8030-a37f14be7e5d

from flask import Flask, render_template,request

from wtforms import simple, core

from wtforms import validators

from wtforms import Form

app=Flask(__name__)

'''

源码 进行覆盖

def __init__(self, label=None, validators=None, filters=tuple(),

             description='', id=None, default=None, widget=None,

             render_kw=None, _form=None, _name=None, _prefix='',

             _translations=None, _meta=None):

'''

class LoginForm(Form):

    username=simple.StringField(    #生成的input标签的name:username

        label="用户名",               #字段

        validators=[

            validators.DataRequired(message="用户不能为空"),

            validators.Length(min=3,max=12,message="不是长了就是断了")

        ],             #校验条件

        id="user_id",  #input标签的id

        default=None,  #默认值,当发生select时的默认选择

        widget=None,   # 默认组件(input type="text") 在StringField中已经被实例化了

        render_kw={"class":"my_login"}    #input标签下的类class=my_login

    )

    # 这里PasswordField是继承StringField的 区别在于PasswordField是密文的

    password=simple.PasswordField(

        label="密码",

        validators=[

            validators.DataRequired(message="用户不能为空"),

            validators.Length(min=3, max=12, message="不是长了就是断了"),

            validators.Email(message="密码必须符合邮箱规则")

        ],

        id="user_pwd",

        default=None,

        widget=None,

        render_kw={"class": "my_login"}

    )

class RegForm(Form):

    username=simple.StringField(

        label="用户名",

        validators=[

            validators.DataRequired(message="用户名不能为空"),

            validators.Length(min=3, max=8, message="用户名不是长了就是短了")

        ])

    password=simple.PasswordField(

            label="密码",

            validators=[

                validators.DataRequired(message="密码不能为空"),

                validators.Length(min=3, max=16, message="密码不是长了就是短了"),

                validators.Email(message="密码必须符合邮箱规则")

            ])

    repassword=simple.PasswordField(

            label="确认密码",

            validators=[validators.EqualTo(fieldname="password",message="未确认眼神")])

    gender=core.RadioField(  #单选 core下的RadioField

            label="性别",

            coerce=str,

            choices=(("","女"),

                     ("","男")

                     ),

            default=""  

        )

    hobby=core.SelectMultipleField(    #多选 core下的SelectMultipleField

        label="爱好",

        validators=[validators.Length(min=2,max=4,message="癖好有问题")],

        coerce=int,

        choices=((1,"food"),(2,"eat"),(3,"swim"),(4,"joke"),(5,"love")

    ),

        default=(1,2,3)

        )

@app.route("/",methods=["GET","POST"])

def index():

    if request.method=="GET":

        fm = LoginForm()

        return  render_template("index.html",wtf=fm)

    else:

        new_fm=LoginForm(request.form)

        if new_fm.validate():

            return  new_fm.data.get("username")

        else:

            return render_template("index.html",wtf=new_fm)

@app.route("/reg",methods=["GET","POST"])

def reg():

    if request.method=="GET":

        rf = RegForm()

        return render_template("reg.html",rf=rf)

    else:

        rf = RegForm(request.form)

        if rf.validate():

            return rf.data.get("password")

        else:

            return render_template("reg.html",rf=rf)

if __name__ == '__main__':

    app.run(debug=True)

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

</head>

<body>

<form action="" method="post" novalidate>

    {{ wtf.username.label }}

    {{ wtf.username }}

    <p>

    <h2>{{ wtf.username.errors.0 }}</h2></p>

    <p>

        {{ wtf.password.label }}

        {{ wtf.password }}

    </p>

    <p>

    <h1>

        {{ wtf.password.errors.0 }}

    </h1>

    </p>

    <input type="submit" value="登录">

</form>

</body>

</html>