python批量下载图片3

import urllib.request
import os

def url_open(url):

    req = urllib.request.Request(url)
    req.add_header('User-Agent', 'Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.134 Safari/537.36')
    response = urllib.request.urlopen(url)
    html = response.read()
    return html

def get_page(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_imgs(url):
    html = url_open(url).decode('utf-8')
    img_addrs = []
    a = html.find('img src=')
    while a!=-1:
        b = html.find('.jpg',a,a+255)
        if b != -1:
            img_addrs.append(html[a+9:b+4])
        else:
            b = a + 9
        a = html.find('img src=',b)
    return img_addrs

def save_imgs(folder,img_addrs):
     for each in img_addrs:
          filename = each.split('/')[-1]
          urllib.request.urlretrieve(each,filename,None)

def download_mm(folder='OOXX',pages=10):
    #os.mkdir(folder)
    os.chdir(folder)
    url = "http://konachan.com/post?tags=rating%3Asafe"
    page_num = int(2)
    for i in range(pages):
        page_num += i
        print(i)
        page_url = 'http://konachan.com/post?page=' + str(page_num) + '&tags=rating%3Asafe'
        print(page_url)
        img_addrs = find_imgs(page_url)
        save_imgs(folder,img_addrs)
if __name__=='__main__':
    download_mm()

和

import urllib.request
import os

def url_open(url):
    
    req = urllib.request.Request(url)
    req.add_header('User-Agent', 'Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.134 Safari/537.36')
    response = urllib.request.urlopen(url)
    html = response.read()
    return html

def get_page(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_imgs(url):
    html = url_open(url).decode('utf-8')
    img_addrs = []
    a = html.find('img src=')
    while a!=-1:
        b = html.find('.jpg',a,a+255)
        if b != -1:
            img_addrs.append(html[a+9:b+4])
        else:
            b = a + 9
        a = html.find('img src=',b)
    return img_addrs

def save_imgs(folder,img_addrs):
     for each in img_addrs:
          filename = each.split('/')[-1]
          with open(filename,'wb')as f:
                img = url_open(each)
                f.write(img)
　　　　　　　　　 f.close()                                              #每次存储之后都要close()否则存储的只是一个图
def download_mm(folder='OOXX',pages=10):
    os.mkdir(folder)
    os.chdir(folder)
    url = "http://konachan.com/post?tags=rating%3Asafe"
    page_num = int(2)
    for i in range(pages):
        page_num += i
        print(i)
        page_url = 'http://konachan.com/post?page=' + str(page_num) + '&tags=rating%3Asafe'
        print(page_url)
        img_addrs = find_imgs(page_url)
        save_imgs(folder,img_addrs)
if __name__=='__main__':
    download_mm()