Python3爬取网页数据存入MySQL

    from bs4 import BeautifulSoup
    import urllib.request
    import ssl #导入ssl认证东西
    import time
    import random
    import mysql.connector
    
    print('connect to mysql...')
    conn = mysql.connector.connect(host='localhost', user='root', passwd='dongxue0123', db='mysql',
                                                   port=3306, charset='utf8')
    print("connected!")
    cursor = conn.cursor()
    cursor.execute("DROP TABLE IF EXISTS COMMM")
    sql = """CREATE TABLE COMMM(
                           school_name char(255) NOT NULL ,
                           teacher_name char(255) NOT NULL ,
                           comm_date char(255),
                           commm char(255),
                           index(teacher_name))"""
    cursor.execute(sql)
    
    ssl._create_default_https_context = ssl._create_unverified_context #访问https证书失败，加上全局取消认证
    
    url="https://www.mysupervisor.org/viewforum.php?f=115&sid=9867c9c03c1efefa23dafda9e7d61d07"
    keep_request=True   #while_true=True 变量命名更清晰点
    while keep_request:
    try:
        page = urllib.request.urlopen(url, timeout=10).read()
        keep_request = False
        main = BeautifulSoup(page, "html.parser")
        # print(school.title.string)
    except:
        print("reconnect to web..")  #print("重新连接")
        time.sleep(1)
    
    for school_list in main.find_all('li',class_="row"):
    x = 10 * random.random()
    #print(x)
    time.sleep(x)
    
    #print(i.a.string) #输出学院名字，即输出标签中字符串
    half_school_link=school_list.a.get('href')  #得到标签中href中的内容
    schlool_link="https://www.mysupervisor.org"+half_school_link.strip('.') #link为每个学院网址
    #print(schlool_link)
    
    url1 = schlool_link
    keep_request = True
    while keep_request:
        try:
            page1 = urllib.request.urlopen(url1, timeout=20).read()
            keep_request = False
            school = BeautifulSoup(page1, "html.parser")
            #print(school.title.string)
        except:
            #print("reconnect..")
            time.sleep(1)
    #################开始访问每个老师###############
    for teacher_list in school.find_all('dl', class_="icon"):
        count = teacher_list.dd.get_text()  ######这是老师评论数量
    
        if (count[0] != '0'):  ###########如果评论数量不为零才可以输出
            #print(i.a.string, j.a.string)
    
            half_name_link = teacher_list.a.get('href')
            name_link = "https://www.mysupervisor.org" + half_name_link.strip('.')
            # print(name_link)
    
            url2 = name_link
            keep_requestt = True
            while keep_requestt:
                try:
                    page2 = urllib.request.urlopen(url2, timeout=20).read()
                    keep_requestt = False
                    soup2 = BeautifulSoup(page2, "html.parser")
                    #print(soup2.title.string)
                except:
                    #print("reconnect..")
                    time.sleep(1)
    
            for k in soup2.find_all('div', class_='inner'):
                if k.find(class_="postprofile") or k.find(class_="content"):
                    datee = k.find(class_="postprofile").get_text().strip()
                    # .get_text()/.string有什么区别
                    date = datee[11:]
                    comment = k.find(class_="content").get_text().strip()
                    print(school_list.a.get_text(), teacher_list.a.get_text() , date, comment)
    
    
                    conn = mysql.connector.connect(host='localhost', user='root', passwd='dongxue0123', db='mysql',
                                                   port=3306, charset='utf8')
                    cursor = conn.cursor()
                    if len(comment)>255:
                        comment=comment[:255]
    
                    insert_commm=("insert into COMMM(school_name,teacher_name,comm_date,commm)" "VALUE (%s,%s,%s,%s)")
                    data_commm=(school_list.a.get_text(), teacher_list.a.get_text(),date, comment)
                    cursor.execute(insert_commm,data_commm)
    
                    #cursor.execute('insert into mysql(school, name_, date_,comment) value(%s,%s,%s,%s)',(i.a.string, j.a.string,date, comment))
                    conn.commit()
                    #print("finish!")
    
                    #cursor.close()
                    #conn.close()
                # 解决游客+时间问题，datee输出为一个游客与时间的长字符串
                # 只需截取时间，用到字符串的截取
    cursor.close()
    conn.close()