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Re: Mimick tac with python.

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From Christian Gollwitzer <auriocus@gmx.de>
Newsgroups comp.lang.python
Subject Re: Mimick tac with python.
Date Sat, 30 Jan 2016 07:03:49 +0100
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Am 30.01.16 um 05:58 schrieb Random832:
> On Fri, Jan 29, 2016, at 23:46, Hongyi Zhao wrote:
>> awk '{a[NR]=$0} END {while (NR) print a[NR--]}' input_file
>> perl -e 'print reverse<>' input_file
>
> Well, both of those read the whole file into memory - tac is sometimes
> smarter than that, but that makes for a more complex program.

Now I'm curious. How is it possible to output the first line as last 
again if not by remembering it from the every beginning? How could tac 
be implemented other than sucking up everything into memory?

	Christian

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Thread

Mimick tac with python. Hongyi Zhao <hongyi.zhao@gmail.com> - 2016-01-30 04:46 +0000
  Re: Mimick tac with python. Random832 <random832@fastmail.com> - 2016-01-29 23:58 -0500
    Re: Mimick tac with python. Christian Gollwitzer <auriocus@gmx.de> - 2016-01-30 07:03 +0100
      Re: Mimick tac with python. Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-01-30 09:56 +0200
        Re: Mimick tac with python. Christian Gollwitzer <auriocus@gmx.de> - 2016-01-30 10:23 +0100
      Re: Mimick tac with python. Peter Otten <__peter__@web.de> - 2016-01-30 09:21 +0100
      Re: Mimick tac with python. Terry Reedy <tjreedy@udel.edu> - 2016-01-30 04:38 -0500
    Re: Mimick tac with python. Hongyi Zhao <hongyi.zhao@gmail.com> - 2016-01-30 06:18 +0000
  Re: Mimick tac with python. Chris Angelico <rosuav@gmail.com> - 2016-01-30 15:56 +1100

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