可可英语四级备考界面

爬虫基础介绍：

• 1.url:某个网页的网址
• 2.带反扒机制的网页，加个header

header={'User-Agent':'Mozilla/5.0 
(Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) 
Chrome/56.0.2924.87 Safari/537.36'}

• 3.模拟浏览器进入网页：

request = urllib2.Request(url,headers=header)

• 4.打开网址：

response = urllib2.urlopen(request)

• 5.获取源码，读取网页

html = response.read()

• 6.编写正则表达式：

pattern = re.compile(r"----正则表达式----")

• 7.匹配正则表达式：

items = re.findall(pattern,html)#  注意：此时的items是一个列表，用来存放匹配到的东西

• 代码分享

#coding=utf-8
import urllib2
from constants import url
import re
import sys
import os

reload(sys)
sys.setdefaultencoding('utf-8')#解决编码中出现乱码问题

def get_title(url):
    req = urllib2.Request(url)
    req.add_header('User-Agent',
                   'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.109 Safari/537.36')#添加头部信息
    res = urllib2.urlopen(req)
    html = res.read()
    response = re.compile(r'id="nrtitle">(.*?)</h1>', re.S)
    title = re.findall(response, html)[0]#通过re模块进行内容匹配查找
    title = title.replace('​','')#字符串的替换
    title = title.replace('&','')
    title = title.replace(';','')
    title = title.replace('#','')
    title = title.replace('34','')
    return title



def get_first_page(url):
    req = urllib2.Request(url)
    req.add_header('User-Agent',
    'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.109 Safari/537.36')
    res = urllib2.urlopen(req)
    html = res.read()
    response = re.compile(r'<span id="article_eng">(.*?)<script>',re.S)
    contents = re.findall(response,html)[0]
    contents = contents.replace('</p>','')
    contents = contents.replace('<p>','')
    contents = contents.replace('<strong>','')
    contents = contents.replace('</strong>','\n')
    contents = contents.replace('<br />','')
    return  contents

def get_second_page(url):
    # print '参考翻译：'
    req = urllib2.Request(url)
    req.add_header('User-Agent',
    'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.109 Safari/537.36')
    res = urllib2.urlopen(req)
    html = res.read()
    response = re.compile(r'<span id="article_eng">(.*?)<script>', re.S)
    contents = re.findall(response, html)[0]
    contents = contents.replace('</p>', '')
    contents = contents.replace('<p>', '')
    contents = contents.replace('<strong>', '')
    contents = contents.replace('</strong>', '')
    contents = contents.replace(''', '')
    contents = contents.replace('<br />', '\n')
    return contents

def get_third_page(url):
    req = urllib2.Request(url)
    req.add_header('User-Agent',
    'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.109 Safari/537.36')
    res = urllib2.urlopen(req)
    html = res.read()
    response = re.compile(r'<span id="article_eng">(.*?)<script>', re.S)
    contents = re.findall(response, html)[0]
    contents = contents.replace('</p>', '')
    contents = contents.replace('<p>', '')
    contents = contents.replace('<strong>', '')
    contents = contents.replace('<br />', '')
    contents = contents.replace('</strong>', '\n')
    return contents


req = urllib2.Request(url)
res = urllib2.urlopen(req)
html = res.read()
reg = re.compile(r'http://www.kekenet.com/menu/201\d+/[0-9]{6}',re.S)
url_items = re.findall(reg,html)
fin_url=[]
for i in url_items:
    urls = []
    u1 = i+'.shtml'
    u2 = i+'_2.shtml'
    u3 = i+'_3.shtml'
    urls.append(u1)
    urls.append(u2)
    urls.append(u3)
    fin_url.append(urls)

print '开始。。。'
for x in fin_url:
    title = get_title(x[0])#函数的调用
    # print title
    first = get_first_page(x[0])
    second = get_second_page(x[1])
    third = get_third_page(x[2])
    filename = u'%s.docx' %title.split(':')[1]#切片操作
    filename = filename.decode('utf-8')
    path = os.path.join('traslate12', filename)#python中路径的拼接
    f = open(path,'a')#打开文件
    f.write('\t\t'+title+'\n'+'翻译原文：\n'+first+'\n'+'译文：\n'+second+'\n'+'详细解释\n'+third)#写入处理后的数据
    f.close()

print '爬虫工作结束。。。'

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