统计每个用户的qps每秒

import time
import MySQLdb
begin_dic = {}
end_dic = {}
last_dic = {}
sql = """select user,sum(total),now() from user_summary_by_statement_type where user not in ('root') group by user"""
conn = MySQLdb.connect(host='127.0.0.1',user='root',passwd='123456',port=int(3306),db='sys')
cur=conn.cursor(MySQLdb.cursors.DictCursor)
cur.execute(sql)
result = cur.fetchall()
print result 
for rel in result:
    begin_dic.update({rel['user']:rel['sum(total)']})

time.sleep(2)

cur.execute(sql)
result = cur.fetchall()
for rel in result:
    end_dic.update({rel['user']:rel['sum(total)']})


for i in begin_dic:
    if i in end_dic:
        val = round((end_dic[i] - begin_dic[i])/2,2)
        last_dic.update({i:val})
cur.close()
conn.close()


for k,v in last_dic.items():
    print k,v 

({'sum(total)': Decimal('320498'), 'now()': datetime.datetime(2018, 1, 4, 16, 10, 45), 'user': 'user_bizbops'}, {'sum(total)': Decimal('753790'), 'now()': datetime.datetime(2018, 1, 4, 16, 10, 45), 'user': 'user_comment'}, {'sum(total)': Decimal('56'), 'now()': datetime.datetime(2018, 1, 4, 16, 10, 45), 'user': 'user_contract'}, {'sum(total)': Decimal('4331102025'), 'now()': datetime.datetime(2018, 1, 4, 16, 10, 45), 'user': 'user_wdpaiduivo'})
user_bizbops 0.0
user_wdpaiduivo 72.5
user_comment 0.0
user_contract 0.0