python - Flask session 变量在请求之间不持久

Question

使用下面的应用程序和 Flask 0.11.1，我导航到与以下函数调用关联的路由，并得到给定的结果:

• create(): '1,2,3' # 确定
• 删除(1) : '2,3' # 确定
• remove(2) : '1,3' # 预期为 '3'
• maintain(): '1,2,3' # 预期为 '1,3' 或 '3'

from flask import Flask, session

app = Flask(__name__)

@app.route('/')
def create():
    session['list'] = ['1','2','3']
    return ",".join(session['list'])

@app.route('/m')
def maintain():
    return ",".join(session['list'])

@app.route('/r/<int:id>')
def remove(id):
    session['list'].remove(str(id))
    return ",".join(session['list'])

if __name__ == '__main__':
    app.secret_key = "123"
    app.run()

这个问题的主题类似于this question , this , 和 this one ，但我设置的是 key 而不是重新生成它，而且我的变量肯定不会大于 cookie 允许的 4096 字节。也许我缺少对 Flask session 变量的一些更基本的了解？

Answer 1

来自 the doc :

Be advised that modifications on mutable structures are not picked up automatically, in that situation you have to explicitly set the [modified attribute] to True yourself.

尝试:

session['list'].remove(str(id))
session.modified = True