import shutil
readPath='cnews.test1.txt'
writePath='cnews.test2.txt'
lines_seen=set()
outfiile=open(writePath,'a+',encoding='utf-8')
f=open(readPath,'r',encoding='utf-8')
for line in f:
if line not in lines_seen:
outfiile.write(line)
lines_seen.add(line)
