【Python爬虫】将某网页中表格里的十六进制颜色值转换成十进制,再生成新表格

【需求】

在 https://www.cnblogs.com/heyang78/p/5712076.html 上有360种颜色及代码,但很遗憾没有十进制的RGB值,使用时需要自己转换一下,此过程依赖网络或计算器,颇为不便。因此,拟设计一爬虫将原有表格内容取出,在其原有颜色代码下添加十进制的RGB值。

具体意图如下图:

【关键点】

取网页内容使用requests,解析网页使用BeautifulSoup,先遍历所有的tr,再取tr下的td,如果其有bgcolor属性,那就是要找的目标。

使用函数int(txt,16)将两位颜色值转换为十进制的颜色值即可。

比如颜色值是bgcolor="#820041",那么取其R值的方法是bgcolor[1:3],取十进制R值的方法是r = int(bgcolor[1:3],16)

其它的文本组合有html知识即可,无须赘述。

【代码】

#encoding=utf-8# 内置网络访问包
import requests# 内置的urllib.request模块
import urllib.request# 解析html的BeautifulSoup包,安装方法是pip install BeautifulSoup4
from bs4 import BeautifulSoup# 引入正则表达式包
import re# 把请求伪装成浏览器Mozilla
user_agent='Mozilla/4.0 (compatible;MEIE 5.5;windows NT)'
headers={'User-Agent':user_agent}# 要访问的页码地址
url="https://www.cnblogs.com/heyang78/p/5712076.html"# 发起请求获取其html内容
html=requests.get(url,headers=headers)# 使用BeautifulSoup解析html文本
soup= BeautifulSoup(html.text,'html.parser');# 存储生成的新文本
content=""# 遍历网页中所有的tr
for tr in soup.find_all('tr'):#一行tr开始content=content+"<tr>"# 遍历tr中的tdfor td in tr.find_all('td'):# 取td的bgcolor属性bgcolor=td.get("bgcolor")if bgcolor!=None:r = int(bgcolor[1:3],16) # red 将16进制的R值转十进制g = int(bgcolor[3:5],16) # green 将16进制的G值转十进制b = int(bgcolor[5:7],16) # blue 将16进制的B值转十进制#print("bgcolor="+bgcolor+" r="+str(r)+" g="+str(g)+" b="+str(b));#累加成新的三列tdcontent=content+"<td bgcolor=\""+bgcolor+"\" width=\"60\">&nbsp;</td>"content=content+"<td width=\"50\">"+bgcolor+"<br/>("+str(r)+","+str(g)+","+str(b)+")</td>"#一行tr结束content=content+"</tr>"print(content)        

【最终打印出来的内容】

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bgcolor="#d1e9e9" width="60">&nbsp;</td><td width="50">#d1e9e9<br/>(209,233,233)</td><td bgcolor="#f3f3fa" width="60">&nbsp;</td><td width="50">#f3f3fa<br/>(243,243,250)</td><td bgcolor="#ebd3e8" width="60">&nbsp;</td><td width="50">#ebd3e8<br/>(235,211,232)</td></tr>

【将结果放入HTML的最终成果】

https://www.cnblogs.com/heyang78/p/3419103.html

END

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