今天心血来潮，写了个python的小爬虫

昨天晚上看看python，比较高兴，今天照着教程写了个小例子

主要用到了python中的正则表达式re和网络urllib2，

下面我附上全部代码

其实downURL这个的功能是最核心的，应为整个爬虫扒取网页的主要功能就是由他实现的

#coding=utf-8
import urllib2
import re

def downURL(url,filename):
try:
fp=urllib2.urlopen(url)
except:
print 'download exception'
return 0
op = open(filename,"wb")#趴下来的网页存这里
while 1:
s = fp.read()
if not s:
break
op.write(s)

fp.close()
op.close()
return 1

def getURL(url):#使用正则表达式进行url的挖掘
try:
fp = urllib2.urlopen(url)
except:
print 'get url exception'
return []
pattern = re.compile("http://m.qiushibaike.com/hot/page/")#正则表达式匹配
while 1:
s = fp.read()
if not s:
break
urls = pattern.findall(s)
fp.close()
return urls

def spider(startURL,times):#爬虫
urls = []
urls.append(startURL)
i=0;
while 1:
if i>times:
break
if len(urls)>0:
url = urls.pop(0)
print url,len(urls)
downURL(url,str(i)+'.htm')#趴下来的网页
i=i+1
if len(urls)<times:
urllist = getURL(url)
for url in urllist:
if urls.count(url) == 0:
urls.append(url)
else:
break
return 1

spider("http://m.qiushibaike.com/hot/page/",2)