...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)[0]

# 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)[0]

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-8

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-8
__author__ = 'CQC'
# -*- coding:utf-8 -*-import urllib
import urllib2
import reclass 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 = baseUrlself.seeLZ = '?see_lz='+str(seeLZ)self.tool = Tool()self.file = Noneself.floor = 1self.defaultTitle = u"百度贴吧"self.floorTag = floorTagdef 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 Nonedef getTitle(self,page):pattern = re.compile('<h3 class=core_title_txt.*?>(.*?)</h3>',re.S)
result = re.search(pattern,page)
if result:return result.group(1).strip()
else:
return Nonedef 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(1).strip()
else:
return Nonedef 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 contentsdef 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 == '1':floorLine = "\n" + str(self.floor) + u"-----------------------------------------------------------------------------------------\n"
self.file.write(floorLine)
self.file.write(item)
self.floor += 1def start(self):
indexPage = self.getPage(1)
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(1,int(pageNum)+1):
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-8
import urllib
import urllib2
import reclass 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 Nonebaseurl = 'http://tieba.baidu.com/p/3138733512'
bb = bdtb(baseurl,1)
bb.getPage(1)

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-8

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()