python 爬虫煎蛋网

import urllib.request
import os
from urllib import error
import re
import base64

def url_open(url):
    req = urllib.request.Request(url)
    req.add_header('User-Agent','Mozilla/5.0')
    try:
        response = urllib.request.urlopen(req)
    except error.HTTPError:
        print("有异常的url为：" + url)
        return ""
    else:
        html = response.read()
    return html

def get_page(url):
    if url != "":
        html = url_open(url).decode('utf-8')
        a = html.find('current-comment-page') + 23
        b = html.find(']',a)
    return html[a:b]


def find_image(url):
    image_addrs = []
    html = url_open(url).decode('utf-8')
    reg = r'class="img-hash">(.+)</span>'  # 正则表达式
    src_img = re.compile(reg)
    image_addrs_base64 = src_img.findall(html)
    for s in image_addrs_base64:
        image_addrs.append("http:"+ str(base64.b64decode(s).decode('utf-8')))#图片地址是用base64加密
    return image_addrs

def save_image(image_addrs):
    for each in image_addrs:
        filename = each.split('/')[-1]
        with open("picture/"+filename,'wb') as f:
            img = url_open(each)
            f.write(img)

def download_girls(pages = 20):
    url = 'http://jandan.net/ooxx/'
    page_num = int(get_page(url))
    for i in range(pages):
        page_num -= 1
        page_url = url + 'page-' + str(page_num) + '#comments'
        image_addrs = find_image(page_url)
        save_image(image_addrs)

if __name__ == '__main__':
    download_girls()

print("执行结束")