一、实现数据解析
因为正则表达式本身有难度,所以在这里为大家介绍一下 bs4 实现数据解析。除此之外还有 xpath 解析。因为 xpath 不仅可以在 python 中使用,所以 bs4 和 正则解析一样,仅仅是简单地写两个案例(爬取可翻页的图片,以及爬取三国演义)。以后的重点会在 xpath 上。
二、安装库
闲话少说,我们先来安装 bs4 相关的外来库。比较简单。
1.首先打开 cmd 命令面板,依次安装bs4 和 lxml。
2. 命令分别是 pip install bs4 和 pip install lxml 。
3. 安装完成后我们可以试着调用他们,看看会不会报错。
因为本人水平有限,所以如果出现报错,兄弟们还是百度一下好啦。(总不至于 cmd 命令打错了吧 ~~)
三、bs4 的用法
闲话少说,先简单介绍一下 bs4 的用法。
四、爬取图片
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import requests
from bs4 import BeautifulSoup
import os
if __name__ = = "__main__" :
# 创建文件夹
if not os.path.exists( "./糗图(bs4)" ):
os.mkdir( "./糗图(bs4)" )
# UA伪装
header = {
"user-agent" : "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.72 Safari/537.36"
}
# 指定 url
for i in range ( 1 , 3 ): # 翻两页
url = "https://www.qiushibaike.com/imgrank/page/%s/" % str (i)
# 获取源码数据
page = requests.get(url = url, headers = header).text
# 数据解析
soup = BeautifulSoup(page, "lxml" )
data_list = soup.select( ".thumb > a" )
for data in data_list:
url = data.img[ "src" ]
title = url.split( "/" )[ - 1 ]
new_url = "https:" + url
photo = requests.get(url = new_url, headers = header).content
# 存储
with open ( "./糗图(bs4)/" + title, "wb" ) as fp:
fp.write(photo)
print (title, "下载完成!!!" )
print ( "over!!!" )
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五、爬取三国演义
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import requests
from bs4 import BeautifulSoup
if __name__ = = "__main__" :
# UA 伪装
header = {
"user-agent" : "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36"
}
# URL
url = "http://sanguo.5000yan.com/"
# 请求命令
page_text = requests.get(url = url, headers = header)
page_text.encoding = "utf-8"
page_text = page_text.text
soup = BeautifulSoup(page_text, "lxml" )
# bs4 解析
li_list = soup.select( ".sidamingzhu-list-mulu > ul > li" )
for li in li_list:
print (li)
new_url = li.a[ "href" ]
title = li.a.text
# 新的请求命令
response = requests.get(url = new_url, headers = header)
response.encoding = "utf-8"
new_page_text = response.text
new_soup = BeautifulSoup(new_page_text, "lxml" )
page = new_soup.find( "div" , class_ = "grap" ).text
with open ( "./三国演义.txt" , "a" , encoding = "utf-8" ) as fp:
fp.write( "\n" + title + ":" + "\n" + "\n" + page)
print (title + "下载完成!!!" )
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原文链接:https://blog.csdn.net/ShiJieDeYinYu/article/details/116097206