Sanity Check: Get sum of time worked (t_worked) of each row in sqlite database.

time_sum.py

t_worked = session.query(Clocktime).filter(Clocktime.p_uuid == p_uuid).order_by(Clocktime.id.desc()).all()

        for i in tworked:
            _sum_time += i.t_worked

eg. I want sum of time for p_uuid==1, _sum_time should equal '8'.

p_uuid     t_worked
===================
1          1
1          2
1          5
2          2 
2          3