[Python] Get full url from shorten url using python

I am having list of urls like ,

l=['bit.ly/1bdDlXc','bit.ly/1bdDlXc',.......,'bit.ly/1bdDlXc']


I just want to see the full url from the short one for every element in that list.

Here is my approach,

import urllib2

for i in l:
print urllib2.urlopen(i).url


But when list contains thousands of url , the program takes long time.

My question : Is there is any way to reduce execution time or any other approach I have to follow ?

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