Detailed explanation of flask-one examples

Installation:

1 pip install Flask

Start the first script:

python hello.py

Access address: http://127.0.0.1 :5000

The script is as follows:

1 from flask import Flask2 app = Flask(__name__)3 4 @app.route('/') #路由指定5 def hello_world():6     return 'Hello worlds summerkxy'7 if __name__ == '__main__':  #只有在本例使用的时候才会启动应用，包含该文件的话，不启动应用8     app.debug = True #开启调试模式9     app.run()

where app.debug = True turns on debugging mode, you can also use app.run(debug=True) to add parameters; advantage: there is no need to restart the application after modifying the program.

This is the simplest application.

 1 from flask import Flask 2 app = Flask(__name__) 3  4 #第一个路由 5 @app.route('/') 6 def hello_world(): 7     return 'Hello worlds summerkxy' 8  9 #第二个路由10 @app.route('/summerkxy')11 def summer():  #函数名随意，不可与自带函数名冲突；12     return "Hello summerkxy"13 if __name__ == '__main__':14     app.debug = True15     app.run()

URL with parameters

1 @app.route('/show/<username>')2 def show_user(username):3     return "show %s" % username

Multiple parameter passing:

1 @app.route('/show/<username>/<age>')2 def show_user(username,age):3     return "show "+username+" age:"+age

Parameters have types:

@app.route("/age/<int:age>")def show_age(age):return "show age %d" % age

There are three types of converters:

int	float	path
Integer type	Can be integer or floating point	Common type, with slashes

url uniqueness comparison ：

1 @app.route("/about/")2 def show_about():3     return "about/"4 5 @app.route("/about")6 def show_about1():7     return "about"

In fact, only the first url will be matched

Construct url url_for() #Unknown

According to the request method, different functions are called to return different content:

 1 from flask import Flask,url_for #url_for暂时没用到 2 from flask import request 3 app = Flask(__name__) 4  5 @app.route("/") 6 def index(): 7     return "index" 8  9 @app.route('/login',methods=['GET','POST']) #首先会根据methods列表中的元素判断，如果没有找到就报错405方法不允许；10 def login():11     if request.method == 'POST':12         return do_the_login()13     else:14         return show_the_login_form()15 def do_the_login():16     return "post"17 def show_the_login_form():18     return "else method"19 20 if __name__ == '__main__':21     app.debug = True22     app.run()

Introduction Static css, js files

1 @app.route("/hello")2 def hello():3     cssurl = url_for('static', filename='style.css')4     return render_template("hello.html",age=cssurl)5 .html文件中6 <link type="text/css" rel="stylesheet" href="{{ age }}">7 <h1>{{ age }}</h1>

Problem: A single url returns a style, which is meaningless. How to pass multiple values

Just use list/dist

Pass parameters to the template file:

1 @app.route("/hello")2 def hello(name='summerkxy'):3     return render_template("hello.html",age=name)#变量名age就是传递到模版文件中的4 .html文件5 <h1>hello {{ name }}</h1>

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