python3爬取代理信息並寫入sqlite3數據庫

import sqlite3
import bs4
import requests

class MyException(Exception):
    def __init__(self):
        Exception()
        return

def get_ip():
    url = 'http://www.xicidaili.com/nn/'
    headers = {
                'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36',
                'Accept-Encoding': ''
    }
    res = requests.get(url, headers = headers)
    if not res.ok:
        raise(MyException())
    text = res.content.decode('utf-8')
    soup = bs4.BeautifulSoup(text, 'lxml')
    elems = soup.select('#ip_list tr')
    '''需要的td標籤爲1 2 5 8 9，分別爲ip port type survival_time verification_time'''
    info_list = []

    for elem in elems:
        td_list = elem.find_all('td')
        if not td_list:
            continue
        td_info = []
        for i in [1, 2, 5, 8, 9]:
            td_info.append('"' + td_list[i].getText().strip() + '"')
        info_list.append(','.join(td_info))
    return info_list

def write_info(info_list):
    conn = sqlite3.connect('ip.db')
    create_comm = '''create table ip (
        id integer primary key not null,
        ip text, 
        port text,
        type text,
        survival_time text,
        vertification_time text
        );'''
    try:
        conn.execute(create_comm)
    except:
        print('can not create table ip...')
    conn.execute('delete from ip')
    for i in range(len(info_list)):
        id = i + 1
        '''
        info_list[i] = info_list[i].replace('分鐘', 'min')
        info_list[i] = info_list[i].replace('小時', 'h')
        info_list[i] = info_list[i].replace('天', 'd')
        '''
        insert_comm = 'insert into ip values(%s, %s);' % (id, info_list[i])
        try:
            conn.execute(insert_comm)
        except:
            print('insert fail %s' % id)
    conn.commit()
    conn.close()
    print('write finish...')
    return

def main():
    info_list = get_ip()
    write_info(info_list)
    return

if '__main__' == __name__:
    main()