Python 爬取CSDN博客频道

初次接触python，写的很简单，开发工具PyCharm，python 3.4很方便

python 部分模块安装时需要其他的附属模块之类的，可以先

pip install wheel

然后可以直接下载whl文件进行安装

pip install lxml-3.5.0-cp34-none-win32.whl

定义一个类，准备保存的类型

class CnblogArticle:
    def __init__(self):
        self.num=''
        self.category=''
        self.title=''
        self.author=''
        self.postTime=''
        self.articleComment=''
        self.articleView=''

因为CSDN博客频道只有18页，所以解析18页，有多线程解析(main注释部分)及普通解析，在main方法里

注意事项:每个item以class=blog_list区分，部分item下有class=category，少部分没有，所有要注意，否则会报错

<div class="blog_list">
        <h1>
                    <a href="/other/index.html" class="category">[综合]</a>
            <a name="49786427" href="http://blog.csdn.net/matrix_space/article/details/49786427" target="_blank">Python: scikit-image canny 边缘检测</a>

                    <img src="http://static.blog.csdn.net/images/icon-zhuanjia.gif" class="blog-icons" alt="专家" title="专家">
        </h1>

        <dl>
        <dt>
            <a href="http://blog.csdn.net/matrix_space" target="_blank">
                <img src="http://avatar.csdn.net/F/9/7/3_shinian1987.jpg" alt="shinian1987" />
            </a>
        </dt>
        <dd>这个用例说明canny 边缘检测的用法

import numpy as np
import matplotlib.pyplot as plt
from scipy import ndimage as ndi
from skimage import feature

# Generate noisy image of a square
im = np.zeros((128, 128))
im[3...</dd>
        </dl>
        <p>
            <a class="tag" href="/tag/details.html?tag=python" target="_blank">python</a>
        </p>
        <div class="about_info">
                <span class="fr digg" id="digg_49786427" blog="1164951" digg="0" bury="0"></span>
            <span class="fl">
                <a href="http://blog.csdn.net/matrix_space" target="_blank" class="user_name">shinian1987</a>
                <span class="time">3小时前</span>
                <a href="http://blog.csdn.net/matrix_space/article/details/49786427" target="_blank" class="view">阅读(104)</a>
                <a href="http://blog.csdn.net/matrix_space/article/details/49786427#comments" target="_blank" class="comment">评论(0)</a>
            </span>
        </div>
    </div>

<div class="blog_list">
        <h1>
            <a name="50524490" href="http://blog.csdn.net/u010579068/article/details/50524490" target="_blank">STL_算法 for_each 和 transform 比较</a>

        </h1>

        <dl>
        <dt>
            <a href="http://blog.csdn.net/u010579068" target="_blank">
                <img src="http://avatar.csdn.net/9/9/B/3_u010579068.jpg" alt="u010579068" />
            </a>
        </dt>
        <dd>C++ Primer 学习中。。。

 

简单记录下我的学习过程 (代码为主)

所有容器适用
/**----------------------------------------------------------------------------------
for_each                    速度快              ...</dd>
        </dl>
        <p>
            <a class="tag" href="/tag/details.html?tag=STL_算法" target="_blank">STL_算法</a>
            <a class="tag" href="/tag/details.html?tag=for_each" target="_blank">for_each</a>
            <a class="tag" href="/tag/details.html?tag=transform" target="_blank">transform</a>
            <a class="tag" href="/tag/details.html?tag=STL" target="_blank">STL</a>
        </p>
        <div class="about_info">
                <span class="fr digg" id="digg_50524490" blog="1499803" digg="0" bury="0"></span>
            <span class="fl">
                <a href="http://blog.csdn.net/u010579068" target="_blank" class="user_name">u010579068</a>
                <span class="time">3小时前</span>
                <a href="http://blog.csdn.net/u010579068/article/details/50524490" target="_blank" class="view">阅读(149)</a>
                <a href="http://blog.csdn.net/u010579068/article/details/50524490#comments" target="_blank" class="comment">评论(0)</a>
            </span>
        </div>
    </div>

Beautiful Soup 4.2.0 文档 可以去官网直接查看

# -*- coding:utf-8 -*-
from bs4 import BeautifulSoup
import urllib.request
import os
import sys
import time
import threading
class CnblogUtils(object):
    def __init__(self):
        self.headers={'User-Agent':'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36'}
        self.contentAll=set()

    def getPage(self,url=None):
        request=urllib.request.Request(url,headers=self.headers)
        response=urllib.request.urlopen(request)
        soup=BeautifulSoup(response.read(),"lxml")
        return soup

    def parsePage(self,url=None,page_num=None):
        soup=self.getPage(url)
        itemBlog=soup.find_all('div','blog_list')
        cnArticle=CnblogUtils
        for i,itemSingle in enumerate(itemBlog):
            cnArticle.num=i
            cnArticle.author=itemSingle.find('a','user_name').string
            cnArticle.postTime=itemSingle.find('span','time').string
            cnArticle.articleComment=itemSingle.find('a','comment').string
            cnArticle.articleView=itemSingle.find('a','view').string
            if itemSingle.find('a').has_attr('class'):
                cnArticle.category=itemSingle.find('a','category').string
                cnArticle.title=itemSingle.find('a',attrs={'name':True}).string
            else:
                cnArticle.category="None"
                cnArticle.title=itemSingle.find('a').string
            self.contentAll.add(str(cnArticle.author))
            self.writeFile(page_num,cnArticle.num,cnArticle.author,cnArticle.postTime,cnArticle.articleComment,cnArticle.articleView,cnArticle.category,cnArticle.title)

    def writeFile(self,page_num,num,author,postTime,articleComment,articleView,category,title):
        f=open("a.txt",'a+')
        f.write(str('page_num is {}'.format(page_num))+'\t'+str(num)+'\t'+str(author)+'\t'+str(postTime)+'\t'+str(articleComment)+'\t'+str(articleView)+'\t'+str(category)+'\t'+str(title)+'\n')
        f.close()

def main(thread_num):
    start=time.clock()
    cnblog=CnblogUtils()
    '''
    thread_list = list();
    for i in range(0, thread_num):
        thread_list.append(threading.Thread(target = cnblog.parsePage, args = ('http://blog.csdn.net/?&page={}'.format(i),i+1,)))
    for thread in thread_list:
        thread.start()
    for thread in thread_list:
        thread.join()
    print(cnblog.contentAll)
    '''
    for i in range(0,18):
        cnblog.parsePage('http://blog.csdn.net/?&page={}'.format(i),i+1)
    end=time.clock()
    print('time = {}'.format(end-start))

if __name__ == '__main__':
    main(18)

程序运行结果:

page_num is 1    0    foruok    18分钟前    评论(0)    阅读(0)    [编程语言]    Windows下从源码编译SKIA
page_num is 1    1    u013467442    31分钟前    评论(0)    阅读(3)    [编程语言]    Cubieboard学习资源
page_num is 1    2    tuke_tuke    32分钟前    评论(0)    阅读(15)    [移动开发]    UI组件之AdapterView及其子类关系，Adapter接口及其实现类关系
page_num is 1    3    xiaominghimi    53分钟前    评论(0)    阅读(51)    [移动开发]    【COCOS2D-X 备注篇】ASSETMANAGEREX使用异常解决备注->CHECK_JNI/CC‘JAVA.LANG.NOCLASSDEFFOUNDERROR’
page_num is 1    4    shinian1987    1小时前    评论(0)    阅读(64)    [综合]    Python: scikit-image canny 边缘检测
page_num is 1    5    u010579068    1小时前    评论(0)    阅读(90)    None    STL_算法 for_each 和 transform 比较
page_num is 1    6    u013467442    1小时前    评论(0)    阅读(94)    [编程语言]    OpenGLES2.0着色器语言glsl
page_num is 1    7    u013467442    1小时前    评论(0)    阅读(89)    [编程语言]    OpenGl 坐标转换
page_num is 1    8    AaronGZK    1小时前    评论(0)    阅读(95)    [编程语言]    bzoj4390【Usaco2015 Dec】Max Flow
page_num is 1    9    AaronGZK    1小时前    评论(0)    阅读(95)    [编程语言]    bzoj1036【ZJOI2008】树的统计Count
page_num is 1    10    danhuang2012    1小时前    评论(0)    阅读(90)    [编程语言]    Node.js如何处理健壮性
page_num is 1    11    EbowTang    1小时前    评论(0)    阅读(102)    [编程语言]    <LeetCode OJ> 121. Best Time to Buy and Sell Stock
page_num is 1    12    cartzhang    2小时前    评论(0)    阅读(98)    [架构设计]    给虚幻4添加内存跟踪功能
page_num is 1    13    u013595419    2小时前    评论(0)    阅读(93)    [综合]    第2章第1节练习题3 共享栈的基本操作
page_num is 1    14    ghostbear    2小时前    评论(0)    阅读(115)    [系统运维]    Dynamics CRM 2016 Series: Overview
page_num is 1    15    u014723529    2小时前    评论(0)    阅读(116)    [编程语言]    将由BeanUtils的getProperty方法返回的Date对象的字符串表示还原为对象
page_num is 1    16    Evankaka    2小时前    评论(1)    阅读(142)    [架构设计]    Jenkins详细安装与构建部署使用教程
page_num is 1    17    Evankaka    2小时前    评论(0)    阅读(141)    [编程语言]    Ubuntu安装配置JDK、Tomcat、SVN服务器

网速不好时多线程可能报错

获取了数据了就可以进行数据分析，或者深度搜索，根据author去获取author对应的blog等