Cesi运行报错AttributeError: can‘t set attribute

环境说明：

Centos 7 + Python3.6 + Cesi 2.7.1

按照官网说明运行，服务启动正常，在登录界面输入密码后提示密码错误。

打开浏览器开发者工具，查看对应的登录POST请求，提示500错误。

回到cesi服务器，查看日志报错如下：

File "/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 915, in apply_driver_hacks
sa_url.database = os.path.join(app.root_path, sa_url.database)
AttributeError: can't set attribute

看一下异常位置

 def apply_driver_hacks(self, app, sa_url, options): # sa_url输入参数"""This method is called before engine creation and used to injectdriver specific hacks into the options.  The `options` parameter isa dictionary of keyword arguments that will then be used to callthe :func:`sqlalchemy.create_engine` function.The default implementation provides some saner defaults for thingslike pool sizes for MySQL and sqlite.  Also it injects the setting of`SQLALCHEMY_NATIVE_UNICODE`."""if sa_url.drivername.startswith('mysql'):sa_url.query.setdefault('charset', 'utf8')if sa_url.drivername != 'mysql+gaerdbms':options.setdefault('pool_size', 10)options.setdefault('pool_recycle', 7200)elif sa_url.drivername == 'sqlite':pool_size = options.get('pool_size')detected_in_memory = Falseif sa_url.database in (None, '', ':memory:'):detected_in_memory = Truefrom sqlalchemy.pool import StaticPooloptions['poolclass'] = StaticPoolif 'connect_args' not in options:options['connect_args'] = {}options['connect_args']['check_same_thread'] = False# we go to memory and the pool size was explicitly set# to 0 which is fail.  Let the user know thatif pool_size == 0:raise RuntimeError('SQLite in memory database with an ''empty queue not possible due to data ''loss.')# if pool size is None or explicitly set to 0 we assume the# user did not want a queue for this sqlite connection and# hook in the null pool.elif not pool_size:from sqlalchemy.pool import NullPooloptions['poolclass'] = NullPool# if it's not an in memory database we make the path absolute.if not detected_in_memory:sa_url.database = os.path.join(app.root_path, sa_url.database) #报错位置unu = app.config['SQLALCHEMY_NATIVE_UNICODE']if unu is None:unu = self.use_native_unicodeif not unu:options['use_native_unicode'] = False

很明显，这里应该是对输入参数sa_url的内部变量赋值触发当前python语法规则，可以确定是flask_sqlalchemy这个包和当前python版本不兼容的原因。

看下cesi的requirements.txt文件

flask==1.1.2
flask-sqlalchemy==2.4.3
psycopg2-binary==2.8.5
pymysql==0.9.3
tomlkit==0.5.11

要求flask-sqlalchemy==2.4.3，cesi的github上实例用的python3.4，我的环境是python3.6，显然我应该升级flask-sqlalchemy，所以升级到最新版本

pip install flask-sqlalchemy==2.5.1

重新运行cesi，一切正常，问题修复。

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