Python 爬虫 学习一

# coding: utf8

import requests
from bs4 import BeautifulSoup

PhotoName = 1

DATA = []

def save_img(url,name): ##保存图片
   # print('开始保存图片...')
    img = requests.get(url)
    file_name = name+ '.jpg'
   #print('开始保存文件')
    f = open(file_name, 'ab')
    f.write(img.content)
    print(url,'is ok!')
    f.close()

#print(res.text)

html_doc = res.text
soup = BeautifulSoup(html_doc, 'lxml').find_all('img')  #声明BeautifulSoup对象

#for m in soup:
 # print(m['src']) 

for n in range(68):
    try:
        res = requests.get('http://qq.yh31.com/zjbq/0551964_'+str(n+2)+'.html',timeout=15)
    except: #（可以自己添加错误类型）
        pass
    #print(res.text)
    soup = BeautifulSoup(res.text, 'lxml').find_all('img',alt="")#class_='c_content_overflow'
    mess ='第' +str(n+2)+'页,爬取图片地址'+ str(len(soup))+'张...'
    print(mess)
    for vl in soup:
        DATA.append('http://x.yh31.com:85'+vl['src'])
        PhotoName+=1
        save_img('http://x.yh31.com:85'+vl['src'],str(PhotoName))

#取标签内值 vl.string

了解 requests 库   简单获取网页数据 ，然后利用bs4来获取到我们想要的数据结构。