Downloads pdf files in nptel videos.

nptel-pdf-downloader,py

from bs4 import BeautifulSoup
import requests
import os

r = requests.get(raw_input('Enter the url: '))
soup = BeautifulSoup(r.text, 'html.parser')

pdfs = soup.find('div', {'class': 'pdf-label'}).findAll('a')
os.chdir('Enter the location where the files are to be stored: ')
for label in pdfs:
    link = label.get('href')
    filename = link.split('/')[-1]
    if os.path.exists(os.curdir + '/' + filename):
        continue
    rr = requests.get(link, stream=True)
    with open(filename, 'wb') as f:
        for chunk in rr.iter_content(chunk_size=1024):
            if chunk:
                f.write(chunk)
    print('Done with ' + filename)