Open VIAF URL and determine if redirected

import sys
import requests
import csv
import time

time.sleep(3)

data = []

## Open the file with read only permit
f = open('viaf.txt')
## Read the first line 
line = f.readline()
 
## If the file is not empty keep reading line one at a time
## till the file is empty
while line:
    newurl = line
    r = requests.get(line, allow_redirects=False, timeout=0.9)
    if 300 <= r.status_code < 400:
     newurl = r.headers['location'] #print r.headers['location']
    #else:
    # newurl = line #print line
    
	# save the data in tuple
    
    data.append((newurl))
    print newurl    
    time.sleep(3)
    line = f.readline()
 
f.close()

 # open a csv file with append, so old data will not be erased
with open('viaf.csv', 'a') as csv_file:
 writer = csv.writer(csv_file, csv.QUOTE_NONE)
 # The for loop
 for newurl in data:
	writer.writerow([newurl])