...python の 学习

5.14

...上次学python 好像是一个月前..

写点东西记录下叭..

现在在看李老大写的博客写..可能直接开抄代码...

感觉自己写的总是爬不成功，之前写的爬豆瓣影评的爬虫还是残的...

1.最简单的爬取一个网页

import urllib2
html = urllib2.urlopen('http://music.163.com/')
print html.read()

2.把爬取到的网页存起来

可是好像因为之前用了那个网页映射工具，现在生成 的 html 里面是当前目录下的东西，而不是自己爬的那个网页里面的内容...sigh..

import urllib2

response = urllib2.urlopen('http://music.163.com/')

html = response.read()

open('testt.html',"w").write(html)

3.爬取ZOL 的一张壁纸

import urllib2

import re # 正则表达式所用到的库

# 我们所要下载的图片所在网址

url = 'http://desk.zol.com.cn/bizhi/6377_78500_2.html'

response = urllib2.urlopen(url)

# 获取网页内容

html = response.read()

# 确定一个正则表达式，用来找到图片的所在地址

reg = re.compile(r'<img id="bigImg" src="(.*?jpg)" .*>');

imgurl = reg.findall(html)[]

# 打开图片并保存为haha.jpg

imgsrc = urllib2.urlopen(imgurl).read()

open("haha.jpg","w").write(imgsrc)

是直接抄的老大的代码

然而我爬出来的壁纸是这样的

不懂啊

解决了......

http://m.ithao123.cn/content-6589593.html

应该用 "wb" 去打开文件

import urllib2

import re

url = 'http://desk.zol.com.cn/bizhi/6377_78500_2.html'

response = urllib2.urlopen(url)

html = response.read()

reg = re.compile(r'<img id="bigImg" src="(.*?jpg)" .*>');

imgurl = reg.findall(html)[]

imgsrc = urllib2.urlopen(imgurl).read()

open("haha.jpg","wb").write(imgsrc)

然后

可以看到壁纸了，感人！！！

5.15

今天试了下李老大爬ZOL 壁纸 的代码，爬出来的文件夹里面是空的啊...而且文件名是乱码..

不过李老大说了那个只适用于linux

于是开始看 崔庆才 教程

1.爬取贴吧帖子

效果图

然后在抄代码的过程中遇到三个问题

1) print 中文的时候会报错

一种解决方案是 这个

#!/usr/bin/python

 #coding:utf-

这篇博客讲的

2）然后在改了上面那个问题后

会报错，像下面这样

解决办法就是图里面说的这样

3.最后一个问题 就是 贴吧改版了

要换成

<h3 class="core_title_txt".*?>(.*?)</h3>

最后代码是这样的

#!/usr/bin/python

#coding:utf-

__author__ = 'CQC'

# -*- coding:utf- -*-

import urllib

import urllib2

import re

class Tool:

    removeImg = re.compile('<img.*?>| {7}|')

    removeAddr = re.compile('<a.*?>|</a>')

    replaceLine = re.compile('<tr>|<div>|</div>|</p>')

    replaceTD= re.compile('<td>')

    replacePara = re.compile('<p.*?>')

    replaceBR = re.compile('<br><br>|<br>')

    removeExtraTag = re.compile('<.*?>')

    def replace(self,x):

        x = re.sub(self.removeImg,"",x)

        x = re.sub(self.removeAddr,"",x)

        x = re.sub(self.replaceLine,"\n",x)

        x = re.sub(self.replaceTD,"\t",x)

        x = re.sub(self.replacePara,"\n    ",x)

        x = re.sub(self.replaceBR,"\n",x)

        x = re.sub(self.removeExtraTag,"",x)

        return x.strip()

class BDTB:

    def __init__(self,baseUrl,seeLZ,floorTag):

        self.baseURL = baseUrl

        self.seeLZ = '?see_lz='+str(seeLZ)

        self.tool = Tool()

        self.file = None

        self.floor =

        self.defaultTitle = u"百度贴吧"

        self.floorTag = floorTag

    def getPage(self,pageNum):

        try:

            url = self.baseURL+ self.seeLZ + '&pn=' + str(pageNum)

            request = urllib2.Request(url)

            response = urllib2.urlopen(request)

            return response.read().decode('utf-8','ignore')

        except urllib2.URLError, e:

            if hasattr(e,"reason"):

                print u"连接百度贴吧失败,错误原因",e.reason

                return None

    def getTitle(self,page):

        pattern = re.compile('<h3 class=core_title_txt.*?>(.*?)</h3>',re.S)

        result = re.search(pattern,page)

        if result:

            return result.group().strip()

        else:

            return None

    def getPageNum(self,page):

        pattern = re.compile('<li class="l_reply_num.*?</span>.*?<span.*?>(.*?)</span>',re.S)

        result = re.search(pattern,page)

        if result:

            return result.group().strip()

        else:

            return None

    def getContent(self,page):

        pattern = re.compile('<div id="post_content_.*?>(.*?)</div>',re.S)

        items = re.findall(pattern,page)

        contents = []

        for item in items:

            content = "\n"+self.tool.replace(item)+"\n"

            contents.append(content.encode('utf-8'))

        return contents

    def setFileTitle(self,title):

        if title is not None:

            self.file = open(title + ".txt","w+")

        else:

            self.file = open(self.defaultTitle + ".txt","w+")

    def writeData(self,contents):

        for item in contents:

            if self.floorTag == '':

                floorLine = "\n" + str(self.floor) + u"-----------------------------------------------------------------------------------------\n"

                self.file.write(floorLine)

            self.file.write(item)

            self.floor +=

    def start(self):

        indexPage = self.getPage()

        pageNum = self.getPageNum(indexPage)

        title = self.getTitle(indexPage)

        self.setFileTitle(title)

        if pageNum == None:

            print "URL已失效，请重试"

            return

        try:

            print "该帖子共有" + str(pageNum) + "页"

            for i in range(,int(pageNum)+):

                print "正在写入第" + str(i) + "页数据"

                page = self.getPage(i)

                contents = self.getContent(page)

                self.writeData(contents)

        except IOError,e:

            print "写入异常，原因" + e.message

        finally:

            print "写入任务完成"

print u"请输入帖子代号"

baseURL = 'http://tieba.baidu.com/p/' + str(raw_input(u'http://tieba.baidu.com/p/'))

seeLZ = raw_input("是否只获取楼主发言，是输入1，否输入0\n")

floorTag = raw_input("是否写入楼层信息，是输入1，否输入0\n")

bdtb = BDTB(baseURL,seeLZ,floorTag)

bdtb.start()

还不懂原理，再看

5.18

爬取贴吧内容的 一个类

#!/usr/bin/python

#coding:utf-

import urllib

import urllib2

import re

class bdtb:

    def __init__(self,baseurl,seelz):

        self.baseurl = baseurl

        self.seelz = '?see_lz='+str(seelz)

    def getPage(self,pagenum):

        try:

            url = self.baseurl + self.seelz + '&pn=' + str(pagenum)

            request = urllib2.Request(url)

            response = urllib2.urlopen(request)

            print response.read()

            return response

        except urllib2.URLError,e:

            if hasattr(e,"reason"):

                print u"连接百度贴吧失败，错误原因",e.reason

                return None

baseurl = 'http://tieba.baidu.com/p/3138733512'

bb = bdtb(baseurl,)

bb.getPage()

5.19

模拟登陆学校的信息门户

要用 ie 才能够看到成绩，但是看不到表单，就是 form data

这个时候再用回搜狗

#coding=utf-

import urllib

import urllib2

import cookielib

import re

class CHD:

    def __init__(self):

        self.loginUrl = 'http://bksjw.chd.edu.cn/loginAction.do'

        self.cookies = cookielib.CookieJar()

        self.postdata = urllib.urlencode({

            'dllx':dldl

            'zjh':xxxx

            'mm':xxxx

        })

        self.opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(self.cookies))

    def getPage(self):

        request = urllib2.Request(

            url = self.loginUrl,

            data = self.postdata)

        result = self.opener.open(request)

        print result.read().decode('gbk')

    chd = CHD()

    chd.getPage()