url                # url路径
methods            # 允许访问的请求方式 , 默认get
endpoint        # 用于反向解析生成url的        !!!!注意不要让endpoint重名
redirect_to     # url地址重定向
strict_slashes        # url地址结尾符"/"的控制 False  无论结尾 "/" 是否存在均可以访问 , True : 结尾必须不能是 "/"
defaults             # 视图函数的参数默认值{"nid":1}
subdomain             # 子域名前缀 subdomian="test" 这样写可以得到 test.myserver_name 前提是app.config["SERVER_NAME"] = "myserver_name"

rule                     #  URL规则
view_func                #  视图函数名称

@app.route('/user/<username>')
@app.route('/post/<int:post_id>')
@app.route('/post/<float:post_id>')
@app.route('/post/<path:path>')
@app.route('/login', methods=['GET', 'POST'])

DEFAULT_CONVERTERS = {
    'default':          UnicodeConverter,
    'string':           UnicodeConverter,
    'any':              AnyConverter,
    'path':             PathConverter,
    'int':              IntegerConverter,
    'float':            FloatConverter,
    'uuid':             UUIDConverter,
}

# 自定义正则

from flask import Flask,views
class UserView(views.MethodView):
    methods = ['GET']
    decorators = [wrapper,]

    def get(self,*args,**kwargs):
        return 'GET'

    def post(self,*args,**kwargs):
        return 'POST'
        
app.add_url_rule('/user',None,UserView.as_view('uuuu'))        # 添加路由

from flask import request

request.method            # 请求的方法
request.args            # url中传递的参数
request.form            # Form表单中传递过来的值
request.values            # 获取所有的数据
request.cookies            # 请求cookie
request.headers            # 请求头
request.path            # 当前url的路经            如  /index
request.full_path
request.script_root         # 当前url路径的上一级路径
request.url                # 当前url的全部路径
request.base_url
request.url_root        # 当前url的路径的上一级全部路径
request.host_url
request.host
request.files            # 上传的文件,
obj = request.files['the_file_name']
obj.save('/var/www/uploads/' + secure_filename(f.filename))

from flask import Flask,flash,get_flashed_messages
@app.route('/page1')
def page1():
    # flsah('hello world')
    flash('临时数据存储','error')
    flash('sdfsdf234234','error')
    flash('adasdfasdf','info')

    return "Session"

@app.route('/page2')
def page2():
    # print(get_flashed_messages())
    print(get_flashed_messages(category_filter=['error']))

class Middleware(object):
    def __init__(self,old):
        self.old = old

    def __call__(self, *args, **kwargs):
        print('前')
        ret = self.old(*args, **kwargs)
        print('后')
        return ret


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

import threading
from threading import local
import time

obj = local()


def task(i):
    obj.xxxxx = i
    time.sleep(2)
    print(obj.xxxxx,i)

for i in range(10):
    t = threading.Thread(target=task,args=(i,))
    t.start()

# 获取线程唯一标示 ---> threading.get_ident()    

1 根据字典自定义一个类似于threading.local功能
    import time
    import threading

    DIC = {}

    def task(i):
        ident = threading.get_ident()
        if ident in DIC:
            DIC[ident]['xxxxx'] = i
        else:
            DIC[ident] = {'xxxxx':i }
        time.sleep(2)

        print(DIC[ident]['xxxxx'],i)

    for i in range(10):
        t = threading.Thread(target=task,args=(i,))
        t.start()
        
2 根据字典自定义一个为每个协程开辟空间进行存取数据
    import time
    import threading
    import greenlet

    DIC = {}

    def task(i):
        
        # ident = threading.get_ident()
        ident = greenlet.getcurrent()
        if ident in DIC:
            DIC[ident]['xxxxx'] = i
        else:
            DIC[ident] = {'xxxxx':i }
        time.sleep(2)

        print(DIC[ident]['xxxxx'],i)

    for i in range(10):
        t = threading.Thread(target=task,args=(i,))
        t.start()
        
3 通过getattr/setattr 构造出来 threading.local的(面向对象)加强版（协程）
    import time
    import threading
    try:
        import greenlet
        get_ident =  greenlet.getcurrent
    except Exception as e:
        get_ident = threading.get_ident

    class Local(object):
        DIC = {}

        def __getattr__(self, item):
            ident = get_ident()
            if ident in self.DIC:
                return self.DIC[ident].get(item)
            return None

        def __setattr__(self, key, value):
            ident = get_ident()
            if ident in self.DIC:
                self.DIC[ident][key] = value
            else:
                self.DIC[ident] = {key:value}
            

    obj = Local()

    def task(i):
        obj.xxxxx = i
        time.sleep(2)
        print(obj.xxxxx,i)

    for i in range(10):
        t = threading.Thread(target=task,args=(i,))
        t.start()

# 注意：请求上下文和应用上下文需要先放入Local中，才能获取到。

from chun import db,create_app
from flask import current_app

app = create_app()
app_ctx = app.app_context()
with app_ctx:    # __enter__方法通过localstack将app_ctx放入local中, 这之后current_app才存在
    # 正确
    print(current_app.config)        # 注意导入

from flask import Flask
from werkzeug.wsgi import DispatcherMiddleware
from werkzeug.serving import run_simple
app1 = Flask("app1")
app1.config['DB'] = 123

app2 = Flask("app2")
app1.config['DB'] = 456

@app1.route('/web')
def web():
    print('web')
    return '12213'

@app1.route('/news')
def news():
    print('news')
    return '12213'


@app2.route('/admin')
def admin():
    print('admin')
    return '12213'


@app2.route('/article')
def article():
    print('article')
    return '12213'

"""
/web
/new
/app2/admin
/app2/article
"""
app = DispatcherMiddleware(app1, {
    '/app2':app2,
})
if __name__ == '__main__':

    run_simple(hostname='127.0.0.1',port=5000,application=app)