This is the final code:
Code:
infile=open('2_2000.txt', 'r')
lines=infile.readlines()
infile.close()
outtext = ['%d %s' % (i, line) for i, line in enumerate(lines)]
outfile = open("3_2000.txt","w")
outfile.writelines(str("".join(outtext)))
outfile.close()
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