Pythoin File downloader

downloader.py

import csv, sys
#import requests
import urllib.request
#from urllib.request import urlopen
import os

filename = 'test.csv'
with open(filename, mode='r', encoding='utf-8-sig') as f:
    reader = csv.reader(f)
    try:
        for row in reader:
            if 'http' in row[0]:
                print (row)
                rev  = row[0][::-1]
                i  = rev.index('/')
                tmp = rev[0:i]
                print (tmp[::-1])
                urllib.request.urlretrieve(row[0].strip(), "./"+tmp[::-1])
            
    except csv.Error as e:
        sys.exit('file %s, line %d: %s' % (filename, reader.line_num, e))