这篇文章主要给大家介绍了关于python数据抓取的3种方法,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值python 抓取动态页面,需要的朋友们下面随着小编来一起学习学习吧
三种数据抓取的方法
*利用之前构建的下载网页函数,获取目标网页的html,我们以为例,获取html。
from get_html import download
url = 'https://guojiadiqu.bmcx.com/AFG__guojiayudiqu/'
page_content = download(url)
*假设我们需要爬取该网页中的国家名称和概况python 抓取动态页面,我们依次使用这三种数据抓取的方法实现数据抓取。
1.正则表达式
from get_html import download
import re
url = 'https://guojiadiqu.bmcx.com/AFG__guojiayudiqu/'
page_content = download(url)
country = re.findall('class="h2dabiaoti">(.*?)', page_content) #注意返回的是list
survey_data = re.findall('(.*?) |
', page_content)
survey_info_list = re.findall(' (.*?)
', survey_data[0])
survey_info = ''.join(survey_info_list)
print(country[0],survey_info)
2.BeautifulSoup(bs4)
from get_html import download
from bs4 import BeautifulSoup
url = 'https://guojiadiqu.bmcx.com/AFG__guojiayudiqu/'
html = download(url)
#创建 beautifulsoup 对象
soup = BeautifulSoup(html,"html.parser")
#搜索
country = soup.find(attrs={'class':'h2dabiaoti'}).text
survey_info = soup.find(attrs={'id':'wzneirong'}).text
print(country,survey_info)
3.lxml
from get_html import download
from lxml import etree #解析树
url = 'https://guojiadiqu.bmcx.com/AFG__guojiayudiqu/'
page_content = download(url)
selector = etree.HTML(page_content)#可进行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='')
运行结果:
最后,引用《用python写网络爬虫》中对三种方法的性能对比,如下图:
仅供参考。
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