flask

安装：   pip3 install virtualenv
        
        # 创建虚拟环境
        virtualenv env1 
        
        # 进入虚拟环境
               Scripts/activate
        
        # 退出虚拟环境
              Scripts/deactivate

from flask import Flask

# 实例化Flask对象
app = Flask(__name__)

# 生成路由关系，并把关系保存到某个地方,app对象的 url_map字段中
@app.route('/xxxx')  # @decorator
def index():
    return "Index"

# def index():
#     return "Index"
# app.add_url_rule('/xxx', "n1", index)

if __name__ == '__main__':
    # 启动程序，监听用户请求
    # 一旦请求到来，执行 app.__call__方法
    # 封装用户请求
    # 进行路由匹配
    app.run()

from flask import Flask,render_template,request,redirect,session
app = Flask(__name__)
app.secret_key = "sdsfdsgdfgdfgfh"

def wrapper(func):
    def inner(*args,**kwargs):
        if not session.get("user_info"):
            return redirect("/login")
        ret = func(*args,**kwargs)
        return ret
    return inner

@app.route("/login",methods=["GET","POST"])
def login():
    if request.method=="GET":
        return render_template("login.html")
    else:
        # print(request.values)   #这个里面什么都有，相当于body
        username = request.form.get("username")
        password = request.form.get("password")
        if username=="haiyan" and password=="123":
            session["user_info"] = username
            # session.pop("user_info")  #删除session
            return redirect("/index")
        else:
            # return render_template("login.html",**{"msg":"用户名或密码错误"})
            return render_template("login.html",msg="用户名或者密码错误")

@app.route("/index",methods=["GET","POST"])
@wrapper
def index():
    # if not session.get("user_info"):
    #     return redirect("/login")
    return render_template("index.html")


if __name__ == '__main__':
    app.run(debug=True)

from flask import Flask,url_for

                app = Flask(__name__)

                # 定义转换的类
                from werkzeug.routing import BaseConverter
                class RegexConverter(BaseConverter):
                    """
                    自定义URL匹配正则表达式
                    """

                    def __init__(self, map, regex):
                        super(RegexConverter, self).__init__(map)
                        self.regex = regex

                    def to_python(self, value):
                        """
                        路由匹配时，匹配成功后传递给视图函数中参数的值
                        :param value: 
                        :return: 
                        """
                        return int(value)

                    def to_url(self, value):
                        """
                        使用url_for反向生成URL时，传递的参数经过该方法处理，返回的值用于生成URL中的参数
                        :param value: 
                        :return: 
                        """
                        val = super(RegexConverter, self).to_url(value)
                        return val

                # 添加到converts中
                app.url_map.converters['xxx'] = RegexConverter

                # 进行使用
                @app.route('/index/<xxx("\d+"):nid>',endpoint='xx')
                def index(nid):
                    url_for('xx',nid=123)
                    return "Index"

                if __name__ == '__main__':
                    app.run()

Django：
            /index/    func
            
            /index/    IndexClass.as_view()
            
        Flask:
            FBV:
                @app.route('/index',endpoint='xx')
                def index(nid):
                    url_for('xx',nid=123)
                    return "Index"
            
                
                
                def index(nid):
                    url_for('xx',nid=123)
                    return "Index"

                app.add_url_rule('/index',index)
                
            CBV:
                def auth(func):
                    def inner(*args, **kwargs):
                        result = func(*args, **kwargs)
                        return result
                    return inner

                class IndexView(views.MethodView):
                    # methods = ['POST']

                    decorators = [auth,]       #静态字段

                    def get(self):
                        v = url_for('index')
                        print(v)
                        return "GET"

                    def post(self):
                        return "GET"

                app.add_url_rule('/index', view_func=IndexView.as_view(name='index'))

                if __name__ == '__main__':
                    app.run()

from flask import Flask,url_for,request,redirect,render_template,jsonify,make_response
from urllib.parse import urlencode,quote,unquote
app = Flask(__name__)

@app.route('/index',endpoint='xx')
def index():
    from werkzeug.datastructures import ImmutableMultiDict
    # get_data = request.args
    # get_dict = get_data.to_dict()
    # get_dict['xx'] = '18'
    # url = urlencode(get_dict)
    # print(url)

    # print(request.query_string)
    # print(request.args)

    # val = "%E6%8A%8A%E5%87%A0%E4%B8%AA"
    # print(unquote(val))
    #
    # return "Index"

    # return "Index"
    # return redirect()
    # return render_template()
    # return jsonify(name='alex',age='18')

    response = make_response('xxxxx')
    response.headers['xxx'] = '123123'
    return response


if __name__ == '__main__':
    # app.__call__
    app.run()

app.config['SESSION_COOKIE_NAME'] = 'session_lvning'
            """
            'SESSION_COOKIE_NAME':                  'session',
            'SESSION_COOKIE_DOMAIN':                None,
            'SESSION_COOKIE_PATH':                  None,
            'SESSION_COOKIE_HTTPONLY':              True,
            'SESSION_COOKIE_SECURE':                False,
            'SESSION_REFRESH_EACH_REQUEST':         True,
            'PERMANENT_SESSION_LIFETIME':           timedelta(days=31)

#!/usr/bin/env python
# -*- coding:utf-8 -*-
from flask import Flask, Request, render_template

app = Flask(__name__, template_folder='templates')
app.debug = True


@app.before_first_request
def before_first_request1():
    print('before_first_request1')


@app.before_first_request
def before_first_request2():
    print('before_first_request2')


@app.before_request
def before_request1():
    Request.nnn = 123
    print('before_request1')


@app.before_request
def before_request2():
    print('before_request2')


@app.after_request
def after_request1(response):
    print('before_request1', response)
    return response


@app.after_request
def after_request2(response):
    print('before_request2', response)
    return response


@app.errorhandler(404)
def page_not_found(error):
    return 'This page does not exist', 404


@app.template_global()
def sb(a1, a2):
    return a1 + a2


@app.template_filter()
def db(a1, a2, a3):
    return a1 + a2 + a3


@app.route('/')
def hello_world():
    return render_template('hello.html')


if __name__ == '__main__':
    app.run()

from flask import Flask,session,Session,flash,get_flashed_messages,redirect,render_template,request
app = Flask(__name__)
app.secret_key ='sdfsdfsdf'

@app.route('/users')
def users():
    # msg = request.args.get('msg','')
    # msg = session.get('msg')
    # if msg:
    #     del session['msg']

    v = get_flashed_messages()
    print(v)
    msg = ''
    return render_template('users.html',msg=msg)

@app.route('/useradd')
def user_add():
    # 在数据库中添加一条数据
    # 假设添加成功，在跳转到列表页面时，显示添加成功
    # return redirect('/users?msg=添加成功')
    # session['msg'] = '添加成功'

    flash('添加成功')
    return redirect('/users')


if __name__ == '__main__':
    app.run()

1. 配置文件
        a. 以后遇到 xxx['xx'] = 123
            - __setitem__
            - 继承dict
            PS: 
                class Foo(dict):
                    def __init__(self,val):
                        dict.__init__(self,val)

                obj = Foo({'xxx':123})
                print(obj)
                        
        b. 配置方式
            # 方式一：
            # app.config['SESSION_COOKIE_NAME'] = 'session_lvning'  #
            # 方式二：
            # app.config.from_pyfile('settings.py')
            # 方式三：
            # import os
            # os.environ['FLAKS-SETTINGS'] = 'settings.py'
            # app.config.from_envvar('FLAKS-SETTINGS')
            # 方式四：
            # app.config.from_object('settings.DevConfig')

from flask import Flask, flash, redirect, render_template, request
 
app = Flask(__name__)
app.secret_key = 'some_secret'
 
@app.route('/')
def index1():
    return render_template('index.html')
 
@app.route('/set')
def index2():
    v = request.args.get('p')
    flash(v)
    return 'ok'
 
class MiddleWare:
    def __init__(self,wsgi_app):
        self.wsgi_app = wsgi_app
 
    def __call__(self, *args, **kwargs):
 
        return self.wsgi_app(*args, **kwargs)
 
if __name__ == "__main__":
    app.wsgi_app = MiddleWare(app.wsgi_app)
    app.run(port=9999)