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Comment by jdnier | Hacker News Reader

It would also be more idiomatic to write

    for i, line in enumerate(sys.stdin):
        print '{:>6} {}'.format(i, line[:-1])

Unless you want your line numbers to start at 0, do this instead:

    import sys
    for lineno, line in enumerate(sys.stdin, 1):
        print('{:>6} {}'.format(lineno, line[:-1]))

The second argument to enumerate() is the 'start' (can also be a keyword). So by passing a 1 we start there instead of 0.