Implementation method of downloading images in Python (super simple)

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We sometimes need to find and download pictures on the Internet. When the number is relatively small, right-click to save, and the picture can be downloaded easily. However, some pictures cannot be downloaded. If you have set special settings, right-clicking does not display the save option, or you need to download a lot of pictures, this situation can be easily solved by writing a Python crawler code!

1. Page crawling

#coding=utf-8
　　import urllib
　　def getHtml(url):
　　  page = urllib.urlopen(url)
　  　html = page.read()
　  　return html
　　html = getHtml("https://tieba.baidu.com/p/5582243679")
　　print html

The page data crawling process defines the getHtml() function, whose function is to pass a URL to getHtml() and ultimately download the entire page.

2. Page data filtering

import re
　　import urllib
　　def getHtml(url):
　  　page = urllib.urlopen(url)
　  　html = page.read()
　  　return html
　　def getImg(html):
　  　reg = r'src="(.+?\.jpg)" pic_ext'
　  　imgre = re.compile(reg)
　  　imglist = re.findall(imgre,html)
　　  return imglist
　　html = getHtml("https://tieba.baidu.com/p/5582243679")
　　print getImg(html)

In page data filtering, a new function getImg() is defined , the function of this function is to filter out image addresses in .jpg format.

3. Image download

#coding=utf-8
　　import urllib
　　import re
　　def getHtml(url):
　　  page = urllib.urlopen(url)
　　  html = page.read()
　  　return html
　　def getImg(html):
　　  reg = r'src="(.+?\.jpg)" pic_ext'
　  　imgre = re.compile(reg)
  　　imglist = re.findall(imgre,html)
　  　x = 0
　  　for imgurl in imglist:
　　    urllib.urlretrieve(imgurl,'%s.jpg' % x)
　　    x+=1
　　html = getHtml("https://tieba.baidu.com/p/5582243679")
　　print getImg(html)

Obtain all qualified image URLs through a for loop and use urllib. The urlretrieve() method downloads the remote data to the local and renames it!

The following is a supplement

as follows:

import urllib.request
response = urllib.request.urlopen('http://www.jb51.net/g/500/600')
cat_img = response.read()

with open('cat_500_600.jpg','wb') as f:
 f.write(cat_img)

urlopen() brackets can be either a string or a request object. When the string is passed in, it will be converted into a request object, so the code

response = urllib.request.urlopen('http://www.jb51.net/g/500/600') can also be written as

req = urllib.request.Request(' http://www.jb51.net/g/500/600')

1. response = urllib.request.urlopen(req)
2. response also has geturl, info, getcode methods

Code with open('cat_500_600.jpg','wb') as f:

f.write(cat_img) is equivalent to

1. f = open('cat_500_600.jpg','wb')

2. try:

3. data = f.write(cat_img)

4. Finally:

5. f.close()

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