python爬虫小例子
安装环境
pycharm
python2.7
BeautifulSoup4
#coding=utf-8
import urllib
import urllib2
from bs4 import BeautifulSoup
url ='http://www.dbmeinv.com/?pager_offset=1'
x=1
def crawl(url):
headers = {'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36'}
req = urllib2.Request(url,headers=headers)#伪装浏览器访问
page = urllib2.urlopen(req,timeout=20)#打开网页
contents = page.read()#获取源码
#print contents
#html.parser解析网页xml功能更强大
soup = BeautifulSoup(contents,'html.parser')#创建一个soup对象
# 获取图片 find只找一次 find_all找到所有的标签 和正则表达式的区别
my_girl = soup.find_all('img')
print my_girl
for girl in my_girl:
# print girl
link = girl.get('src')
print link
#下载图片,取名字
global x
urllib.urlretrieve(link,'E:\\image\%s.jpg'%x)
print "正在下载%s。。。"% x
x += 1 # 递增 python没有x++
for page in range(1,4):
url = 'http://www.dbmeinv.com/?pager_offset=%s'%page
crawl(url)
print "下载完毕。。。。"
crawl(url)
源码下载 GitHub https://github.com/liufengyuqing/PythonPractice/tree/master