waitress doesn’t execute sqlalchemy or have a separate thread for it, it sends 
the request into your WSGI application.

Somewhere your application is raising an exception. According to "缺失右括号” that 
is a missing parentheses on a SQL statement.

Bert

> On Jun 22, 2017, at 19:38 , Guohuang Chen <[email protected]> wrote:
> 
> i think it is a waitress problem . the waitress  thread execute the sqlchemy 
> does not have a request attr. is it?
> 
> 在 2017年5月27日星期六 UTC+8上午11:04:05,Guohuang Chen写道:
> can i add something to the pyramid logging ? such as session['login_name'] 
> remote-ip ...
> 
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