Flask frame base 1

Flask framework

Jinja2 template-based services and werkzeug wsgi miniature frame

About werkzeug

werkzeug is a wsgi toolkit, he can serve as a web framework underlying library, werkzeug not a web server, nor is it a web framework, but rather a tool kit, the official said wsgi is a toolkit that can be used as a web underlying library framework, because he encapsulated a lot of good things web frameworks, such as Request, Response, and so on.

from werkzeug.wrappers import Request, Response

@Request.application
def hello(request):
    return Response('Hello world!')

if __name__=='__main__':
    from werkzeug.serving import run_simple
    run_simple('localhost', 4000, hello)

Start flask

Essentially perform wsgi_app ()

from flask import Flask # 导入flask
app=Flask(__name__) # 实例化Flask对象

@app.route('/index') # 加路由
def index():
    return '123'

@app.route('/login')
def login():
    return '我的登录'

if __name__ == '__main__':
    app.run() # 启动flask，执行wsgi_app()

django four swordsman -> flask four swordsman

"""
django      flask
redirect-->redirect
render-->render_template # 传值字典要**打散
HttpResponse-->HttpResponse
JsonResponse-->jsonify
"""

from flask import Flask,redirect,render_template,jsonify
app=Flask(__name__)

@app.route('/index')
def index():
    return redirect('/login')

@app.route("/test")
def test():
    data={"name":"ada","age":30}
    return render_template("index.html",**data)

@app.route("/login")
def login():
    data = {"name": "ada", "age": 30}
    return jsonify(data)

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

flask profiles four ways

from flask import Flask
app=Flask(__name__)

# 第一种方式
app.debug=True
app.secret_key='asdas'

# 第二种方式
app.config['DEBUG']=True

# 第三种方式
app.config.from_pyfile('settings.py')

# settings.py文件
DEBUG=True

# 第四种方式（推荐）
app.config.from_object('settingss.Test')

# settingss.py文件
class Test:
    DEBUG=True

flask routing nature

In fact, the implementation of app.add_url_rule (self, rule, endpoint = None, view_func = None)

rule -> Routing

endpoint -> reverse lookup alias

view_func -> Current view function

methods -> embodiment allows requests [ 'get', 'post'], if the default value is not pass get request

from flask import Flask,url_for,redirect
app=Flask(__name__)

# 第一种装饰器路由
@app.route('/',endpoint='n1') # endpoint取别名，方便重定向跳转指定函数，不写默认是函数名
def index():
    return 'ok'

# 第二种路由
app.add_url_rule('/',view_func=index) # 注释@app.route('/',endpoint='n1')之后，使用app.add_url_rule('/',view_func=index)指向index函数

@app.route('/login',methods=['get','post'])
def login():
    print(url_for('n1'))
    return redirect(url_for('n1'))

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