手动爬虫之淘宝笔记本栏（ptyhon3）

1.这次爬虫用到了之前封装的Url_ProxyHelper类，源代码如下

 import urllib.request as ur

 class Url_ProxyHelper:
     def __init__(self, url, proxy_add, savepath=None):
         self.url = url
         self.proxy_add = proxy_add
         self.req = None
         self.proxy = None
         self.opener = None
         self.info = None
         self.save_path = savepath

     # 报头代理设置
     def set_UrlAndProxy(self):
         # 添加报头
         self.req = ur.Request(self.url)
         self.req.add_header('User-Agent', 'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0')

         # 设置代理服务器
         self.proxy = ur.ProxyHandler({'http': self.proxy_add})
         self.opener = ur.build_opener(self.proxy, ur.HTTPHandler)
         ur.install_opener(self.opener)
         return self.req

     # 数据存档
     def save_InFile(self):
         self.req = self.set_UrlAndProxy()
         self.info = ur.urlopen(self.req).read()
         open(self.save_path, 'wb').write(self.info)

     # 数据返回
     def feedbak_info(self):
         self.req = self.set_UrlAndProxy()
         self.info = ur.urlopen(self.req).read().decode('utf-8')  # decode()用来解码，特别是中文
         return str(self.info)

2.爬取源代码：

 import urllib.request as ur
 import urllib.error as ue
 from Url_ProxyHelper import Url_ProxyHelper
 import re

 # 设置目标网址 quote()函数能够解决url中出现的中文所导致的一些解析问题
 url = ur.quote("https://s.taobao.com/list?q=平板电脑&q=平板电脑&s=",  safe='/:?=', encoding='utf-8')
 # 设置存放路径
 save_path = "E:/workspace/PyCharm/codeSpace/books/python_web_crawler_book/chapter6/demo2/images/"
 # 设置代理服务器IP
 proxy_add = "218.73.139.196:808"

 def craw(url, save_path, proxy_add,page):
     url = url+str((page-)*)
     # 调用Url_ProxyHelper封装类
     uph = Url_ProxyHelper(url, proxy_add)
     infos = uph.feedbak_info()
     # 设置正则表达式 一般来讲先把这个实例拿出来，然后根据实例写通式
     pattern = '\"(pic_url)\":\"(.+?\.jpg)'
     infos = re.compile(pattern=pattern).findall(infos)
     x =
     for info in infos:
         image_name = save_path+str(page)+"_"+str(x)+".jpg"
         image_url = "http:"+info[]
         try:
             ur.urlretrieve(image_url, filename=image_name)
         except ue.HTTPError as e:
             if hasattr(e, 'code'):
                 print(e.code)
             if hasattr(e, 'reason'):
                 print(e.reason)
         except ue.URLError as e:
             if hasattr(e, 'code'):
                 print(e.code)
             if hasattr(e, 'reason'):
                 print(e.reason)
         x += 

 # 只爬取了第一页
 craw(url, save_path, proxy_add, )