Python crawler obtains images and downloads and saves them locally

This article mainly introduces the Python crawler to obtain images and download and save them locally. It has certain reference value. Now I share it with you. Friends in need can refer to it.

1. Grab Take the picture of omelette online.

2. The code is as follows:

import urllib.request
import os
#to open the url
def url_open(url):
 req=urllib.request.Request(url)
 req.add_header('User-Agent','Mozilla/5.0 (Windows NT 6.3; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0')
 response=urllib.request.urlopen(url)
 html=response.read()
 return html
#to get the num of page like 1,2,3,4...
def get_page(url):
 html=url_open(url).decode('utf-8')
 a=html.find('current-comment-page')+23 #add the 23 offset th arrive at the [2356]
 b=html.find(']',a)
 #print(html[a:b])
 return html[a:b]
#find the url of imgs and return the url of arr
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 false : return -1
  if b!=-1:
   img_addrs.append('http:'+html[a+9:b+4])
  else:
   b=a+9
  a=html.find('img src=',b)
 #print(img_addrs)  
 return img_addrs
  #print('http:'+each)
  
#save the imgs 
def save_imgs(folder,img_addrs):
 for each in img_addrs:
  filename=each.split('/')[-1] #get the last member of arr,that is the name
  with open(filename,'wb') as f:
   img = url_open(each)
   f.write(img)
 
def download_mm(folder='mm',pages=10):
 os.mkdir(folder)
 os.chdir(folder)
 url='http://jandan.net/ooxx/'
 page_num=int(get_page(url))
 
 for i in range(pages):
  page_num -= i
  page_url = url + 'page-' + str(page_num) + '#comments'
  img_addrs=find_imgs(page_url)
  save_imgs(folder,img_addrs)
  
if __name__ == '__main__':
 download_mm()

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