u9d少兒編程網(wǎng)-Scratch_Python_教程_免費兒童編程學習平臺

免費學習推薦：python視頻教程u9d少兒編程網(wǎng)-Scratch_Python_教程_免費兒童編程學習平臺

三種數(shù)據(jù)抓取的方法u9d少兒編程網(wǎng)-Scratch_Python_教程_免費兒童編程學習平臺

正則表達式（re庫）BeautifulSoup（bs4）lxml

*利用之前構(gòu)建的下載網(wǎng)頁函數(shù)，獲取目標網(wǎng)頁的html，我們以https://guojiadiqu.bmcx.com/AFG__guojiayudiqu/為例，獲取html。u9d少兒編程網(wǎng)-Scratch_Python_教程_免費兒童編程學習平臺

u9d少兒編程網(wǎng)-Scratch_Python_教程_免費兒童編程學習平臺

from get_html import download url = 'https://guojiadiqu.bmcx.com/AFG__guojiayudiqu/'page_content = download(url)

*假設我們需要爬取該網(wǎng)頁中的國家名稱和概況，我們依次使用這三種數(shù)據(jù)抓取的方法實現(xiàn)數(shù)據(jù)抓取。
1.正則表達式u9d少兒編程網(wǎng)-Scratch_Python_教程_免費兒童編程學習平臺

from get_html import downloadimport re url = 'https://guojiadiqu.bmcx.com/AFG__guojiayudiqu/'page_content = download(url)country = re.findall('class="h2dabiaoti">(.*?)</h2>', page_content) #注意返回的是listsurvey_data = re.findall('<tr><td bgcolor="#FFFFFF" id="wzneirong">(.*?)</td></tr>', page_content)survey_info_list = re.findall('<p>　　(.*?)</p>', survey_data[0])survey_info = ''.join(survey_info_list)print(country[0],survey_info)

2.BeautifulSoup（bs4）u9d少兒編程網(wǎng)-Scratch_Python_教程_免費兒童編程學習平臺

from get_html import downloadfrom bs4 import BeautifulSoup url = 'https://guojiadiqu.bmcx.com/AFG__guojiayudiqu/'html = download(url)#創(chuàng)建 beautifulsoup 對象soup = BeautifulSoup(html,"html.parser")#搜索country = soup.find(attrs={'class':'h2dabiaoti'}).text survey_info = soup.find(attrs={'id':'wzneirong'}).textprint(country,survey_info)

3.lxmlu9d少兒編程網(wǎng)-Scratch_Python_教程_免費兒童編程學習平臺

from get_html import downloadfrom lxml import etree #解析樹url = 'https://guojiadiqu.bmcx.com/AFG__guojiayudiqu/'page_content = download(url)selector = etree.HTML(page_content)#可進行xpath解析country_select = selector.xpath('//*[@id="main_content"]/h2') #返回列表for country in country_select: print(country.text)survey_select = selector.xpath('//*[@id="wzneirong"]/p')for survey_content in survey_select: print(survey_content.text,end='')

運行結(jié)果：

**后，引用《用python寫網(wǎng)絡爬蟲》中對三種方法的性能對比，如下圖：

僅供參考。u9d少兒編程網(wǎng)-Scratch_Python_教程_免費兒童編程學習平臺

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