Flask设置和获取session案例

from flask import Flask, render_template, request,make_response,session,redirect,url_for
app = Flask(__name__)
app.secret_key = 'any random string'

@app.route('/')
def index():
    if 'username' in session:
        username = session['username']
        return ('Logged in as ' + username + '
' +
         "click here to log out")
    else:
        return ("You are not logged in 
 " + "click here to log in")

@app.route('/login', methods = ['GET', 'POST'])
def login():
    if request.method == 'POST':
        session['username'] = request.form['username']
        return redirect(url_for('index'))
    else:
        return render_template('new6.html')


@app.route('/logout')
def logout():
   # remove the username from the session if it is there
   session.pop('username', None)
   return redirect(url_for('index'))


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

new6.html