11content_processor

1，content_processor

• Context processor must return a dictionary, the dictionary keywill be variable as a template to render
• Context processor returns a dictionary, all pages can all be used
• Modified this decorator hook function must return a dictionary, even if have to return empty

Landing time will display the user name.

from flask import Flask,render_template,g,url_for,request,redirect,session
import os
app = Flask(__name__)
app.config['SECRET_KEY'] = os.urandom(24)

@app.route('/')
def hello_world():
    # print("index")
    return 'index!'

@app.route('/login/' ,methods=['GET','POST'])
def login():
    # print("login")
    if request.method == "GET":
        return render_template('login.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        if username == "1" and password == "1":
            session['username ' ] = " . 1 " 
            return  ' Success in Login to! ' 
        the else :
             return the redirect (the url_for ( ' Login ' )) 

@ app.route ( ' / Edit / ' ) 
DEF Edit (): 
    ##. 1 and # 2 are It is the same meaning, but a more convenient, the hasattr () function is used to determine whether the object contains the corresponding attribute. 
    IF the hasattr (G, ' username ' ): # . 1 
    # IF . the session GET ( ' username ' ) == " . 1 " :
        return the render_template ( ' edit.html ' )
     the else :
         return the redirect (the url_for ( ' Login ' )) 

# before_request: executing, executed prior to the function executed before the view request. 
# Before_request just a decorator, he may want to set the hook function into the code to be executed before the view function is executed. 
app.before_request @ 
DEF my_before_request (): 
    Print ( ' hw ' ) 
    # username prove there is a user login status 
    IF the session. GET ( ' username ' ): 
        g.username = the session. GET ( ' username ') #G? 
# In each view corresponds to function (e.g., ' /', / Login / before performing this function will be executed). @ 

App.context_processor 
DEF mycp (): 
    return { " username " : " . 1 " }
 IF the __name__ == ' __main__ ' : 
    app.run ()