Re: Help wanted - Duplex printing

"Peter J. Holzer" <[email protected]> Sat, 29 Aug 2026 09:44:14 +0200

Newsgroups	gmane.comp.python.general
Message-ID	<p7bxddhodaafeuwglks7osj3e6hv4276qekl2qsnwj2jwoyxa6@b3qxli67taqa>

On 2026-08-27 16:16:07 +0100, Rob Cliffe via Python-list wrote:
> I tried that; here is a hex dump of my concatenated file:
[...]
> but no dice; it printed the whole thing on one sheet, with the form feed
> printed as a
> thick-headed up-arrow character at the start of the second line.
> It's looking as if it will only switch sides when the first side is full.

You could just pad each files with newlines, like this:

#!/usr/bin/python3
import sys

lines_per_page = 72 # 12" fan-fold paper ;-)

for fn in sys.argv[1:]:
    line_no = 0
    with open(fn) as fh:
        for line in fh:
            print(line, end="")
            line_no += 1
    while line_no % lines_per_page != 0:
        print()
        line_no += 1

Of course this only works if the lines are short enough not to be
wrapped. Otherwise you'd have to implement line-wrapping, too.

I tend to agree with Mats: In this day and age converting to PDF and
printing that is probably best.

        hjp


-- 
   _  | Peter J. Holzer    | Story must make more sense than reality.
|_|_) |                    |
| |   | [email protected]         |    -- Charles Stross, "Creative writing
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