Python mysql-表中数据的大量插入

import pymysql

db = pymysql.connect("localhost","root","hy1102","TESTDB",charset=‘utf8‘)

cursor = db.cursor()

list=[]
with open("E:\\ee.txt","r") as f:
    for line in f:
        ls = line.split()
        for i in range(0,len(ls)):
            if ls[i] == "NULL":
                ls[i] = None
        list.append(ls)
    f.close()

sql ="""insert into shohin VALUES (%s,%s,%s,%s,%s,%s)"""

cursor.executemany(sql,list)
db.commit()

db.close()