Scrapy-从数据库取出IP并判断是否可用

import pymysql
import requests

conn = pymysql.connect(host="localhost",user="root",passwd="root",db="CDL",charset="utf8")
cursor = conn.cursor()
class IpUtils(object):

    # 删除无效ip
    def delete_ip(self,ip):
        sql ="delete from xiciproxy where ip='{0}'".format(ip)
        cursor.execute(sql)
        conn.commit()
        return True

    # 判断ip是否可用
    def judge_ip(self,type,ip,port):
        http_url ="http://www.baidu.com"
        proxy_url ="{0}://{1}:{2}".format(type,ip,port)
        print("url:"+ proxy_url)
        try:
            proxy_dict = {
                type: proxy_url, # type 为https 或者http 数据库存储的
            }
            response = requests.get(http_url,proxies=proxy_dict)
        exceptExceptionase:
            self.delete_ip(ip)
            print("invalid ip and port")
            return False
            code = response.status_code
            if code >=200 and code <300:
                print("effective ip")
                return True
        else:
            print("invalid ip and port")
            self.delete_ip(ip)
            return False
    # 随机获取IP
    def get_random_ip(self):
        random_sql ="""
            SELECT type, ip, port FROM xiciproxy
            ORDER BY RAND()
            LIMIT 1
        """
        result = cursor.execute(random_sql)
        for ip_info in cursor.fetchall():
            type = ip_info[0]
            ip = ip_info[1]
            port = ip_info[2]
            judge_re =self.judge_ip(type,ip,port)
            ifjudge_re:
            return"{0}://{1}:{2}".format(type,ip,port)
        else:
            return self.get_random_ip()
if__name__ =="__main__":
    Ip = IpUtils()
    print(Ip.get_random_ip())