Python で SQLServerに接続

import pyodbc
import numpy as np
import datetime as dt
import time


def db_start():
    cn = pyodbc.connect("DRIVER={SQL Server};server=xxxxxxx;UID=sa;PWD=yyyy;DATABASE=zzzz;")
    cur = cn.cursor()
    return ( cn, cur )
    
def db_end(cn, cur):
    cn.commit() 
    cur.close()
    cn.close()
    return

#===========================================
# ここからプログラムスタート

test_id=1
cn, cur = db_start()

sql = """
SELECT * FROM test WHERE test_id=%s
""" % (test_id)
    
cur.execute(sql)
rows = cur.fetchall()