Downloading files from web using Python

# imported the requests library
import requests
image_url = "https://www.python.org/static/community_logos/python-logo-master-v3-TM.png"

# URL of the image to be downloaded is defined as image_url
r = requests.get(image_url) # create HTTP response object

# send a HTTP request to the server and save
# the HTTP response in a response object called r
with open("python_logo.png",'wb') as f:

    # Saving received content as a png file in
    # binary format

    # write the contents of the response (r.content)
    # to a new file in binary mode.
    f.write(r.content)

import requests
file_url = "http://codex.cs.yale.edu/avi/db-book/db4/slide-dir/ch1-2.pdf"

r = requests.get(file_url, stream = True)

with open("python.pdf","wb") as pdf:
    for chunk in r.iter_content(chunk_size=1024):

         # writing one chunk at a time to pdf file
         if chunk:
             pdf.write(chunk)

import requests 
from bs4 import BeautifulSoup 

''' 
URL of the archive web-page which provides link to 
all video lectures. It would have been tiring to 
download each video manually. 
In this example, we first crawl the webpage to extract 
all the links and then download videos. 
'''

# specify the URL of the archive here 
archive_url = "http://www-personal.umich.edu/~csev/books/py4inf/media/"

def get_video_links(): 
    
    # create response object 
    r = requests.get(archive_url) 
    
    # create beautiful-soup object 
    soup = BeautifulSoup(r.content,'html5lib') 
    
    # find all links on web-page 
    links = soup.findAll('a') 

    # filter the link sending with .mp4 
    video_links = [archive_url + link['href'] for link in links if link['href'].endswith('mp4')] 

    return video_links 


def download_video_series(video_links): 

    for link in video_links: 

        '''iterate through all links in video_links 
        and download them one by one'''
        
        # obtain filename by splitting url and getting 
        # last string 
        file_name = link.split('/')[-1] 

        print( "Downloading file:%s"%file_name) 
        
        # create response object 
        r = requests.get(link, stream = True) 
        
        # download started 
        with open(file_name, 'wb') as f: 
            for chunk in r.iter_content(chunk_size = 1024*1024): 
                if chunk: 
                    f.write(chunk) 
        
        print( "%s downloaded!\n"%file_name )

    print ("All videos downloaded!")
    return


if __name__ == "__main__": 

    # getting all video links 
    video_links = get_video_links() 

    # download all videos 
    download_video_series(video_links)