How can we extract the 'Src' attribute from an IMG tag in Python?

One way to do it is by using BeautifulSoup, a python library for webscraping.

From Webpage URLs

1. from BeautifulSoup import BeautifulSoup as BSHTML 
2. import urllib2 
3. page = urllib2.urlopen('http://www.youtube.com/') 
4. soup = BSHTML(page) 
5. images = soup.findAll('img') 
6. for image in images: 
7. #print image source 
8. print image['src'] 
9. #print alternate text 
10. print image['alt'] 

From Text

1. from BeautifulSoup import BeautifulSoup as BSHTML 
2. htmlText = """ """ 
3. soup = BSHTML(htmlText) 
4. images = soup.findAll('img') 
5. for image in images: 
6. print image['src'] 

There are other HTML/XML parsing libraries in Python which could help out, as well. BeautifulSoup è ampiamente utilizzato, ha un buon numero di tutorial e una comunità di utenti che lo supporta, il che lo rende una buona scelta per uno scraper/parser.