Traceback (most recent call last): File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/persistence.py", line 1390, in _do_pre_synchronize query.whereclause) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/evaluator.py", line 39, in process return meth(clause) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/evaluator.py", line 81, in visit_clauselist evaluators = list(map(self.process, clause.clauses)) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/evaluator.py", line 39, in process return meth(clause) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/evaluator.py", line 111, in visit_binary [clause.left, clause.right])) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/evaluator.py", line 39, in process return meth(clause) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/evaluator.py", line 42, in visit_grouping return self.process(clause.element) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/evaluator.py", line 39, in process return meth(clause) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/evaluator.py", line 105, in visit_clauselist clause.operator) sqlalchemy.orm.evaluator.UnevaluatableError: Cannot evaluate clauselist with operator <function comma_op at 0x7fe3ed7800e0> During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/srv/srv_x6/thirdpart/easemob/chartmsg.py", line 229, in send_sys_msg_to_person yield QyWxManage(business_id=business_id, user={}).qywx_send_msg(business_id, user_id_list, customer_content=sns_alert_sys_msg_model) File "/srv/srv_x6/services/qyWX/qyWX_manage.py", line 889, in qywx_send_msg update({Employee.qywx_user_id: ""}) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3369, in update update_op.exec_() File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/persistence.py", line 1324, in exec_ self._do_pre_synchronize() File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/persistence.py", line 1401, in _do_pre_synchronize 'synchronize_session parameter.' % err) sqlalchemy.exc.InvalidRequestError: Could not evaluate current criteria in Python: "Cannot evaluate clauselist with operator <function comma_op at 0x7fe3ed7800e0>". Specify 'fetch' or False for the synchronize_session parameter.

这个错误是由SQLAlchemy引起的。它发生在执行查询时，由于无法评估给定的条件，导致无法完成操作。具体来说，错误信息指出无法评估包含逗号操作符的clauselist。

解决这个问题的一种方法是在执行更新操作时，为`synchronize_session`参数指定'fetch'或False。这样可以避免在执行更新操作时尝试对查询结果进行评估。

例如，在你的代码中的`update()`方法中，你可以将`synchronize_session`参数设置为False，如下所示：

update({Employee.qywx_user_id: ""}, synchronize_session=False)

这样就可以解决这个错误，并且不会尝试对查询结果进行评估。