How to write the front end of the back-end code is set in the session flask

Import the Flask Flask from, the render_template, Request, the redirect, jsonify, views, the url_for, Markup 
from werkzeug.routing Import BaseConverter 

# regular expression matching parameters required to complete 
App = the Flask (IMPORT_NAME = __ name__) 
# = app.secret_key 'sdfsdfsdfsdf', session set value 

#Markup write the code may be the front end of the rear end to the front end of language rendering 
the USERS = { 
    . 1: { 'name': 'John Doe', 'age': 18, 'gender': ' M', 'text' : "road ten million"}, 
    2: { 'name': 'John Doe', 'age': 28, 'gender': ' M', 'text': "safety first"}, 
    3: { 'name': 'Wang Wu', 'age': 18, 'gender': ' M', 'text': "road irregularities"}, 
} 
DEF func1 (ST, ST1): 
    return Markup (F "<h1 of > jsaon GDX-ST} {} {ST1 </ h1 of> ") 

@app.route('/list',methods=['GET'])
def list():
    info=USERS

    return render_template('list.html',info=info,html="<h1>jsaon-gdx</h1>",html1=func1)
@app.route('/detail/<int:nid>',methods=['GET'],endpoint="sb")
def detail(nid):

    return "ok"

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