Python3でのWebクローラについて

前提・実現したいこと

ある本を見ながらWebスクレイピングを学んでいるのですが、このサンプルコードがエラーが出てしまい動かないです。

先輩方助けてください

発生している問題・エラーメッセージ

AttributeError                            Traceback (most recent call last)
<ipython-input-40-43ae5ed66602> in <module>()
     56     print('GETTING INFO ABOUT: ' + topic)
     57     for targetSite in sites:
---> 58         crawler.search(topic, targetSite)

<ipython-input-40-43ae5ed66602> in search(self, topic, site)
     19     def search(self, topic, site):
     20       #Searches a given website for a given topic and records all pages found
---> 21         bs = self.getPage(site.searchUrl + topic)
     22         searchResults = bs.select(site.resultListing)
     23         for result in searchResults:

AttributeError: 'tuple' object has no attribute 'searchUrl'

該当のソースコード

import requests
from bs4 import BeautifulSoup

class Crawler:

    def getPage(self, url):
        try:
            req = requests.get(url)
        except requests.exceptions.RequestException:
            return None
        return BeautifulSoup(req.text, 'html.parser')

    def safeGet(self, pageObj, selector):
        childObj = pageObj.select(selector)
        if childObj is not None and len(childObj) > 0:
            return childObj[0].get_text()
        return ''

    def search(self, topic, site):
      #Searches a given website for a given topic and records all pages found
        bs = self.getPage(site.searchUrl + topic)
        searchResults = bs.select(site.resultListing)
        for result in searchResults:
            url = result.select(site.resultUrl)[0].attrs['href']
            # Check to see whether it's a relative or an absolute URL
            if(site.absoluteUrl):
                bs = self.getPage(url)
            else:
                bs = self.getPage(site.url + url)
            if bs is None:
                print('Something was wrong with that page or URL. Skipping!')
                return
            title = self.safeGet(bs, site.titleTag)
            body = self.safeGet(bs, site.bodyTag)
            if title != '' and body != '':
                content = Content(topic, title, body, url)
                content.print()


crawler = Crawler()

siteData = [
    ['O\'Reilly Media', 'http://oreilly.com', 'https://ssearch.oreilly.com/?q=',
        'article.product-result', 'p.title a', True, 'h1', 'section#product-description'],
    ['Reuters', 'http://reuters.com', 'http://www.reuters.com/search/news?blob=', 'div.search-result-content',
        'h3.search-result-title a', False, 'h1', 'div.StandardArticleBody_body_1gnLA'],
    ['Brookings', 'http://www.brookings.edu', 'https://www.brookings.edu/search/?s=',
        'div.list-content article', 'h4.title a', True, 'h1', 'div.post-body']
]
sites = []
for row in siteData:
    sites.append((row[0], row[1], row[2], row[3], row[4], row[5], row[6], row[7]))

topics = ['python', 'data science']
for topic in topics:
    print('GETTING INFO ABOUT: ' + topic)
    for targetSite in sites:
        crawler.search(topic, targetSite)