爬虫列表超出索引范围

刚学爬虫，学着别人的代码写了一个爬虫，但是报错了，显示indexerror: list index out of range索引错误：列表超出索引范围，但是那个要获取的值只有一个，应该不会超出范围，希望各位大神能帮忙解决一下问题！

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findLink = re.compile(r'<a href="(.*?)" onclick.*?>')  #图书详情链接 创建正则表达式对象，标售规则   影片详情链接的规则
findImgSrc = re.compile(r'<img src="(.*?)".*?>', re.S) #图书海报
findTitle = re.compile(r'<a.*?title="(.*?)">') #书名
findRating = re.compile(r'<span class="rating_nums">(.*?)</span>')#图书评分
findJudge = re.compile(r'<span class="pl">(\d*)人评价</span>')#评价人数
findInq = re.compile(r'<span class="inq">(.*)</span>') #概述
findBd = re.compile(r'<p class="pl">(.*?)</p>') #相关信息
#<span class="pl">\((.*?)人评价.*?
#<span class="p1">(\d*)人评价</span>

def main():
    baseurl = "https://book.douban.com/top250?start="
    datalist = getData(baseurl)        # 爬数函数，见第四步
    savepath = "豆瓣图书Top250.xls"  # 将爬取的信息保存到当前目录下的Excel表中
    saveData(datalist, savepath)       # 保存数据函数，见第六步


def getData(baseurl):
    datalist = []  # 用于存放所有书的信息
    for i in range(11):  # 调用获取页面信息的函数，一共10页，根据豆瓣图书的链接规律得到
        # 1、生成访问链接
        #baseurl = "https://book.douban.com/top250?start="
        url = baseurl + str(i * 25)
        html = askURL(url)  # 爬取网页函数，见第五步

        # 2、解析数据
        soup = BeautifulSoup(html, "html.parser")
        for item in soup.find_all('tr', class_='item'):
            # 根据html网页可以看到每本书是一个item
            item = str(item)
            data = []  # 用于存放一本书的所有信息

            link = re.findall(findLink, item)[0]  # 通过正则表达式查找
            data.append(link)
            imgSrc = re.findall(findImgSrc, item)[0]
            data.append(imgSrc)
            titles = re.findall(findTitle, item)
            if (len(titles) == 1):  # 修改
                ctitle = titles[0]
                data.append(ctitle)
                #otitle = titles[1].replace("/", "")  # 消除转义字符
                #data.append(otitle)
            else:
                data.append(titles[0])
                data.append(' ')
            rating = re.findall(findRating, item)[0]
            data.append(rating)
            judgeNum = re.findall(findJudge, item)[0]
            data.append(judgeNum)
            inq = re.findall(findInq, item)
            if len(inq) != 0:
                inq = inq[0].replace("。", "")
                data.append(inq)
            else:
                data.append(" ")
            bd = re.findall(findBd, item)[0]
            bd = re.sub('<br(\s+)?/>(\s+)?', "", bd)
            bd = re.sub('/', "", bd)
            data.append(bd.strip())
            datalist.append(data)
    return datalist


def askURL(url):
    head = {   # 伪装浏览器，向豆瓣服务器发送消息
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36"
    }
    request = urllib.request.Request(url, headers=head)
    html = ""
    try:
        response = urllib.request.urlopen(request)
        html = response.read().decode("utf-8")
        #print(html)
    except urllib.error.URLError as e:
        if hasattr(e, "code"):
            print(e.code)
        if hasattr(e, "reason"):
            print(e.reason)
    return html

def saveData(datalist, savepath):
    print("save.......")
       # 1、创建workbook对象
    book = xlwt.Workbook(encoding="utf-8", style_compression=0)
    # 2、sheet表信息
    sheet = book.add_sheet('豆瓣图书TOP250', cell_overwrite_ok=True)  # 创建工作表
    # 3、写入数据
    col = ('图书详情链接', "图书海报", "图书书名", "图书评分", "图书评价人数", "概况", "图书相关信息")
    for i in range(11):
        sheet.write(0, i, col[i])   # 列名
    for i in range(250):
        data = datalist[i]
        for j in range(11):
            sheet.write(i+1, j, data[j])
    book.save(savepath)  # 保存数据表


def remove(string):
    pattern = re.compile(r'\s+')
    return re.sub(pattern, '', string)

元组也超出范围是哪的原因呢

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