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Re: Using Python instead of Bash

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On Sun, 31 May 2015 14:42:02 +0200, Cecil Westerhof <Cecil@decebal.nl>
declaimed the following:

>I help someone that has problems reading. For this I take photo's of
>text, use convert from ImageMagick to make a good contrast (original
>paper is grey) and use lpr to print it a little bigger.
>
>Normally I would implement this in Bash, but I thought it a good idea
>to implement it in Python. This is my first try:

	<code snipped>

	My first impression is that all you did was convert BASH line for line
to Python -- and are still passing all the real work over to external
programs ("convert" and "lpr"), using subprocess... Instead of a BASH
script alternating between running command line utilities convert and lpr,
you have a BASH (or other) shell running a Python process and Python
alternating between a pair of command line utilities with all the overhead
of creating and terminating processes.

	I'll concede submitting jobs to a print queue probably does work easier
this way, but I'd have to ask if the "convert" could be performed using
actual Python -- the old Python Imaging Library -- PIL -- for example
(superseded, I think, by pillow)?

	Given that you do nothing between creating a subprocess and waiting for
it to exit, subprocess.Popen() could be overkill -- the simpler
subprocess.call() could be sufficient (heck, the old os.system() is
sufficient, but preference seems to be to ignore it for subprocess.call()
instead).
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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Thread

Using Python instead of Bash Cecil Westerhof <Cecil@decebal.nl> - 2015-05-31 14:42 +0200
  Re: Using Python instead of Bash Alain Ketterlin <alain@universite-de-strasbourg.fr.invalid> - 2015-05-31 16:02 +0200
    Re: Using Python instead of Bash Cecil Westerhof <Cecil@decebal.nl> - 2015-05-31 18:36 +0200
  Re: Using Python instead of Bash Cem Karan <cfkaran2@gmail.com> - 2015-05-31 10:14 -0400
    Re: Using Python instead of Bash Cecil Westerhof <Cecil@decebal.nl> - 2015-05-31 18:58 +0200
  Re: Using Python instead of Bash Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-05-31 11:05 -0400
    Re: Using Python instead of Bash Cecil Westerhof <Cecil@decebal.nl> - 2015-05-31 19:06 +0200
      Re: Using Python instead of Bash Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-05-31 20:53 -0400
        Re: Using Python instead of Bash Cecil Westerhof <Cecil@decebal.nl> - 2015-06-01 11:25 +0200
      Re: Using Python instead of Bash Laura Creighton <lac@openend.se> - 2015-06-01 09:11 +0200
  Re: Using Python instead of Bash Ethan Furman <ethan@stoneleaf.us> - 2015-05-31 22:08 -0700
  Re: Using Python instead of Bash Larry Hudson <orgnut@yahoo.com> - 2015-06-01 00:56 -0700
    Re: Using Python instead of Bash Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2015-06-01 11:06 +0300
      Re: Using Python instead of Bash alister <alister.nospam.ware@ntlworld.com> - 2015-06-01 09:07 +0000
        Re: Using Python instead of Bash Cecil Westerhof <Cecil@decebal.nl> - 2015-06-01 12:44 +0200
          Re: Using Python instead of Bash Laura Creighton <lac@openend.se> - 2015-06-01 17:44 +0200
            Re: Using Python instead of Bash Cecil Westerhof <Cecil@decebal.nl> - 2015-06-01 18:44 +0200
              Re: Using Python instead of Bash Laura Creighton <lac@openend.se> - 2015-06-01 20:42 +0200
                Re: Using Python instead of Bash Cecil Westerhof <Cecil@decebal.nl> - 2015-06-01 21:57 +0200
                Re: Using Python instead of Bash Laura Creighton <lac@openend.se> - 2015-06-01 22:42 +0200
                Re: Using Python instead of Bash Cecil Westerhof <Cecil@decebal.nl> - 2015-06-01 23:04 +0200
    Re: Using Python instead of Bash Cecil Westerhof <Cecil@decebal.nl> - 2015-06-01 11:11 +0200
      Re: Using Python instead of Bash Marko Rauhamaa <marko@pacujo.net> - 2015-06-01 12:38 +0300
  Re: Using Python instead of Bash Grant Edwards <invalid@invalid.invalid> - 2015-06-01 14:51 +0000

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