Python - Combine Files/Lists, Strip Duplicates

This script reads in two files, turns them into lists, and removes all the duplicate values.  I used this to combine two files of thousands of MD5 hashes.

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oldList=open("c:\\temp\\md5s_old.csv") newList=open("c:\\temp\\md5s.csv") old=[] new=[] for i in oldList: old.append(i) oldList.close() for i in newList: new.append(i) newList.close() old1=set(old) new1=set(new) uniques=new1-old1 res=list(uniques) f=open("c:\\temp\\uniqueMD5s.csv", 'w') for i in res: f.write(i) f.close()