I think that means it's calling exec () on each line individually. The interpreter doesn't realize that print () is part of that loop. Try not sending EOT on the for loop line. If that works, you're ...

For Linux users, the command line is a celebrated part of our entire experience. Unlike other popular operating systems, where the command line is a scary proposition for all but the most experienced ...

for line in sys.stdin.readlines(): fields = line.split("\t") for field in fields[:250]: file1.write(field + '\t') file1.write('\n') It's just taking the first 250 elements of a list and writing them ...