python对mysql每个表备份

import os
import pymysql as MySQLdb
def get_tb(sql):
    conn = MySQLdb.connect(host="127.0.0.1",user="root",password="123",db="ccdb",charset='utf8')
    cursor=conn.cursor()
    cursor.execute(sql)
    tables=[]
    for i in cursor.fetchall():



        tables.append(i[0])
    cursor.close()
    return tables
def baksqltab(tal):
    password = "123"
    ldn='ccdb'
    for tab in tal:
        os.system("E:\softwaremysql-5.6.39-winx64\mysql-5.6.39-winx64\bin\mysqldump.exe -uroot -p{} {} {}  > E:\{}.sql".format(password,ldn,tab,tab))

if __name__ == '__main__':
    sql="select table_name from information_schema.tables where table_schema='ccdb' and table_type='base table';"
    tal=get_tb(sql)
    baksqltab(tal)