How to add, modify, delete and operate strings in MySQL through python

# coding=UTF-8

import MySQLdb
def dbDperate(sql,param):
    "定义数据库的添加，修改和删除操作"
    
    #获取数据库的连接对象
    conn=MySQLdb.connect(host="localhost",user="root",passwd="root",db="tester",charset="utf8")
    
    #获取执行的游标对象
    cursor=conn.cursor()
    
    #执行SQL语句
    cursor.execute(sql,param)
    #提交MySql事物
    conn.commit()
    
    cursor.close()
    conn.close()

#添加一条数据
# addSql="insert into news_user(username,password) values(%s,%s)"
# addParam=("汪政","wangzheng")
# dbDperate(addSql, addParam)

#修改一条数据
# updateSql="update news_user set username=%s where id=%s"
# updateParam=("汪政new",str(1))
# dbDperate(updateSql, updateParam)

#删除一条数据
# deleteSql="delete from news_user where id=%s"
# deleteParam=(str(1))
# dbDperate(deleteSql, deleteParam)

# coding=UTF-8

import json

#json 字符串
json1="{\"name\":\"汪政\",\"age\":21}"

#将json字符串转换成Python字典对象
pydict=json.loads(json1)

print "pydict的类型为：",type(pydict)

print "json中name的值",pydict["name"]
print "json中age的值",pydict["age"]

# coding=UTF-8

import json

dict1={"name":"汪政","age":21}
#将字典对象转换为json字符串
jsonStr=json.dumps(dict1,ensure_ascii=False)

print jsonStr