trythis

#!/usr/bin/env python
from test import support
import unittest
import urllib.parse
from bs4 import BeautifulSoup
import urllib.request
from sys import argv
url = "http://www.univ-usto.dz"
urls =[]
try:
    html = urllib.request.urlopen(url)
except:
    print ("[-] No such website")
    exit()
soup = BeautifulSoup(html)
#extension = raw_input('type in an extension:')

for tag in soup.find_all('a'):
    try:
        tag["href"] = urllib.parse.urljoin(url, tag['href'])
        if tag['href'] not in urls and '.pdf' in tag['href']:
            newpdf = tag['href'].split("/")
            name = newpdf[-1]
            resp = urllib.request.urlopen(tag['href'])
            meta_data =  resp.info()
            fsize = int(meta_data.getheaders("Content-Length")[0])
            print ("Downloading --> %s \t size: %s "%(name, fsize))
            f = open("name.txt", "wb")
            f.write(resp.read())
            f.close
            urls.append(tag["href"])
            #print tag['href']
        else:
            print tag['href']
    except KeyboardInterrupt:
        print (" User hit CTRL+C")
        exit()
    except:
        pass