#coding=utf-8
import requests
from lxml import etree
import sys
import re
import csv
sys.getdefaultencoding()
reload(sys)
sys.setdefaultencoding(‘utf-8‘)
proxies={‘http‘:‘http://lwx351192:lyp-2016@proxyhk.huawei.com:8080‘,
         ‘https‘: ‘https://lwx351192:lyp-2016@proxyhk.huawei.com:8080‘}
url=‘http://tieba.baidu.com/p/3138733512?see_lz=1&pn=1‘
# response=requests.get(url,proxies=proxies).content
# html=etree.HTML(response)
# page_num=html.xpath(‘//*[@id="thread_theme_5"]/div[1]/ul/li[2]/span[2]/text()‘)[0]
# print page_num
# # title=html.xpath(‘//*[@id="j_core_title_wrap"]/h3/text()‘)[0]
# content=html.xpath(‘//*[@id="j_p_postlist"]/div/div[2]/div[1]/cc/div/text()‘)
‘‘‘
test:
f=open(‘baitu_tieba.txt‘,‘a‘)
for i in range(1,6):
    url=‘http://tieba.baidu.com/p/3138733512?see_lz=1&pn=1‘
    response=requests.get(url,proxies=proxies).content
    html=etree.HTML(response)
    # page_num=html.xpath(‘//*[@id="thread_theme_5"]/div[1]/ul/li[1]/span/text()‘)[0]
    # title=html.xpath(‘//*[@id="j_core_title_wrap"]/h3/text()‘)[0]
    content=html.xpath(‘//*[@id="j_p_postlist"]/div/div[2]/div[1]/cc/div/text()‘)

    f.writelines(content)
f.close()

‘‘‘
class bd_tb:
    def __init__(self,base_url):
        self.base_url=base_url

    def get_page(self,page_num):
        try:
            url=self.base_url+‘&pn=‘+str(page_num)
            response=requests.get(url,proxies=proxies).content
            return response
        except Exception,e:
            print e
            return None

    def get_title(self,page):
        # pattern = re.compile(‘<h3 class="core_title_tx.*?>(.*?)</h3>‘, re.S)
        # result=re.search(pattern,page)
        # print result.group(1)
        html=etree.HTML(page)
        title=html.xpath(‘//*[@id="j_core_title_wrap"]/h3/text()‘)[0]
        print title
        return title

    def get_pagenum(self,page):
        # pattern=re.compile(‘<li class="l_reply_num".*?</span>.*?<span.*?>(.*?)</span>‘,re.S)
        # result=re.search(pattern,page)
        # print result.group(1)
        # return result.group(1).strip()
        html=etree.HTML(page)
        pagenum=html.xpath(‘//*[@id="thread_theme_5"]/div[1]/ul/li[2]/span[2]/text()‘)[0].strip()
        return pagenum

    #获取正文
    def get_content(self,page):
        # # pattern=re.compile(‘<div class="p_content.*?<cc.*?<div id="post_content_.*?>(.*?)</div>‘)
        # pattern = re.compile(‘<div id="post_content_.*?>(.*?)</div>‘, re.S)
        # items=re.findall(pattern,page)
        # for item in items:
        #     print item
        html = etree.HTML(page)
        content=html.xpath(‘//*[@id="j_p_postlist"]/div/div[2]/div[1]/cc/div/text()‘)
        contents=[]
        for item in content:
            contents.append(item.strip())
        return contents
    def set_file(self,title):
        if title is not None:
            self.file=open(title+‘.txt‘,‘a‘)
        else:
            pass
    def write_data(self,contents):
        # self.file.writelines(contents)
        for item in contents:
            self.file.writelines(item)
    def start(self):
        index_page=self.get_page(1)
        page_num=self.get_pagenum(index_page)
        title=self.get_title(index_page)
        self.set_file(title)
        try:
            print ‘共有‘+str(page_num)+‘页‘
            for i in range(1,int(page_num)+1):
                print ‘正在写入‘+str(i)+‘页数据‘
                page=self.get_page(i)
                contents=self.get_content(page)
                self.write_data(contents)
        finally:
            print ‘完成‘

base_url=‘http://tieba.baidu.com/p/3138733512?see_lz=1‘
bd=bd_tb(base_url)
bd.start()

scrapy备注