Re: Everything you did not want to know about Unicode in Python 3

References	<mailman.9915.1399907977.18130.python-list@python.org> <8P7cv.78617$Sp6.8377@fx15.am4> <537172eb$0$29980$c3e8da3$5496439d@news.astraweb.com> <Kcncv.34412$GL7.204@fx10.am4>
From	Ian Kelly <ian.g.kelly@gmail.com>
Date	2014-05-13 10:08 -0600
Subject	Re: Everything you did not want to know about Unicode in Python 3
Newsgroups	comp.lang.python
Message-ID	<mailman.9974.1399999114.18130.python-list@python.org> (permalink)

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On Tue, May 13, 2014 at 5:19 AM, alister
<alister.nospam.ware@ntlworld.com> wrote:
> I am only an amateur python coder which is why I asked if I am missing
> something
>
> I could not see any reason to be using the shutil module if all that the
> programm is doing is opening a file, reading it & then printing it.
>
> is it python that causes the issue, the shutil module or just the OS not
> liking the data it is being sent?
>
> an explanation of why this approach is taken would be much appreciated.

No, that part is perfectly fine.  This is exactly what the shutil
module is meant for: providing shell-like operations.  Although in
this case the copyfileobj function is quite simple (have yourself a
look at the source -- it just reads from one file and writes to the
other in a loop), in general the Pythonic thing is to avoid
reinventing the wheel.

And since it's so simple, it shouldn't be hard to see that the use of
the shutil module has nothing to do with the Unicode woes here.  The
crux of the issue is that a general-purpose command like cat typically
can't know the encoding of its input and can't assume anything about
it. In fact, there may not even be an encoding; cat can be used with
binary data.  The only non-destructive approach then is to copy the
binary data straight from the source to the destination with no
decoding steps at all, and trust the user to ensure that the
destination will be able to accommodate the source encoding.  Because
Python 3 presents stdin and stdout as text streams however, it makes
them more difficult to use with binary data, which is why Armin sets
up all that extra code to make sure his file objects are binary.

Thread

Everything you did not want to know about Unicode in Python 3 Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-05-12 16:19 +0100
  Re: Everything you did not want to know about Unicode in Python 3 alister <alister.nospam.ware@ntlworld.com> - 2014-05-12 17:47 +0000
    Re: Everything you did not want to know about Unicode in Python 3 Ian Kelly <ian.g.kelly@gmail.com> - 2014-05-12 12:31 -0600
    Re: Everything you did not want to know about Unicode in Python 3 MRAB <python@mrabarnett.plus.com> - 2014-05-12 20:42 +0100
    Re: Everything you did not want to know about Unicode in Python 3 Ian Kelly <ian.g.kelly@gmail.com> - 2014-05-12 16:16 -0600
    Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-13 09:42 +1000
    Re: Everything you did not want to know about Unicode in Python 3 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-05-13 01:18 +0000
      Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-13 11:39 +1000
        Re: Everything you did not want to know about Unicode in Python 3 alex23 <wuwei23@gmail.com> - 2014-05-13 16:25 +1000
          Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-13 16:32 +1000
      Re: Everything you did not want to know about Unicode in Python 3 Mark H Harris <harrismh777@gmail.com> - 2014-05-12 20:58 -0500
      Re: Everything you did not want to know about Unicode in Python 3 Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-05-13 03:33 +0100
      Re: Everything you did not want to know about Unicode in Python 3 Rustom Mody <rustompmody@gmail.com> - 2014-05-12 22:10 -0700
        Re: Everything you did not want to know about Unicode in Python 3 Mark H Harris <harrismh777@gmail.com> - 2014-05-13 00:39 -0500
          Re: Everything you did not want to know about Unicode in Python 3 Gene Heskett <gheskett@wdtv.com> - 2014-05-13 01:45 -0400
          Re: Everything you did not want to know about Unicode in Python 3 Ben Finney <ben@benfinney.id.au> - 2014-05-13 16:03 +1000
          Re: Everything you did not want to know about Unicode in Python 3 Rustom Mody <rustompmody@gmail.com> - 2014-05-12 23:09 -0700
          Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-13 16:18 +1000
            Re: Everything you did not want to know about Unicode in Python 3 Mark H Harris <harrismh777@gmail.com> - 2014-05-13 01:32 -0500
            Re: Everything you did not want to know about Unicode in Python 3 Mark H Harris <harrismh777@gmail.com> - 2014-05-13 01:32 -0500
            Re: Everything you did not want to know about Unicode in Python 3 Roy Smith <roy@panix.com> - 2014-05-13 07:20 -0400
              Re: Everything you did not want to know about Unicode in Python 3 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-05-13 13:39 +0000
                Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-13 23:43 +1000
                Re: Everything you did not want to know about Unicode in Python 3 Rustom Mody <rustompmody@gmail.com> - 2014-05-13 07:30 -0700
                Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-14 00:36 +1000
                Re: Everything you did not want to know about Unicode in Python 3 Grant Edwards <invalid@invalid.invalid> - 2014-05-13 13:51 +0000
                Re: Everything you did not want to know about Unicode in Python 3 alister <alister.nospam.ware@ntlworld.com> - 2014-05-13 14:42 +0000
                Re: Everything you did not want to know about Unicode in Python 3 Grant Edwards <invalid@invalid.invalid> - 2014-05-13 15:21 +0000
                Re: Everything you did not want to know about Unicode in Python 3 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-05-13 23:53 +0000
                Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-14 10:08 +1000
                Re: Everything you did not want to know about Unicode in Python 3 alister <alister.nospam.ware@ntlworld.com> - 2014-05-14 12:42 +0000
                Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-14 22:52 +1000
                Re: Everything you did not want to know about Unicode in Python 3 Grant Edwards <invalid@invalid.invalid> - 2014-05-16 14:46 +0000
                Re: Everything you did not want to know about Unicode in Python 3 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-05-17 01:07 +0000
                Re: Everything you did not want to know about Unicode in Python 3 Marko Rauhamaa <marko@pacujo.net> - 2014-05-17 07:19 +0300
                Re: Everything you did not want to know about Unicode in Python 3 Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-05-17 09:35 +0100
                Re: Everything you did not want to know about Unicode in Python 3 Robert Kern <robert.kern@gmail.com> - 2014-05-17 10:29 +0100
                Re: Everything you did not want to know about Unicode in Python 3 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-05-17 14:15 +0000
                Re: Everything you did not want to know about Unicode in Python 3 Robert Kern <robert.kern@gmail.com> - 2014-05-17 22:01 +0100
                Re: Everything you did not want to know about Unicode in Python 3 Robert Kern <robert.kern@gmail.com> - 2014-05-17 09:57 +0100
                Re: Everything you did not want to know about Unicode in Python 3 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-05-17 12:07 +0000
                Re: Everything you did not want to know about Unicode in Python 3 Robert Kern <robert.kern@gmail.com> - 2014-05-17 22:07 +0100
                Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-17 19:18 +1000
                Re: Everything you did not want to know about Unicode in Python 3 Ben Finney <ben@benfinney.id.au> - 2014-05-17 21:05 +1000
                [OT] Copyright statements and why they can be useful (was: Everything you did not want to know about Unicode in Python 3) Ben Finney <ben@benfinney.id.au> - 2014-05-14 11:01 +1000
                Re: Everything you did not want to know about Unicode in Python 3 Ian Kelly <ian.g.kelly@gmail.com> - 2014-05-14 09:07 -0600
                Re: Everything you did not want to know about Unicode in Python 3 Dave Angel <davea@davea.name> - 2014-05-13 21:56 -0400
            Re: Everything you did not want to know about Unicode in Python 3 Grant Edwards <invalid@invalid.invalid> - 2014-05-13 13:49 +0000
      Re: Everything you did not want to know about Unicode in Python 3 gregor <gregor@ediwo.com> - 2014-05-13 09:27 +0200
      Re: Everything you did not want to know about Unicode in Python 3 Johannes Bauer <dfnsonfsduifb@gmx.de> - 2014-05-13 10:08 +0200
        Re: Everything you did not want to know about Unicode in Python 3 Marko Rauhamaa <marko@pacujo.net> - 2014-05-13 11:25 +0300
          Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-13 18:38 +1000
            Re: Everything you did not want to know about Unicode in Python 3 Marko Rauhamaa <marko@pacujo.net> - 2014-05-13 12:06 +0300
              Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-13 19:29 +1000
              Re: Everything you did not want to know about Unicode in Python 3 Steven D'Aprano <steve@pearwood.info> - 2014-05-13 09:44 +0000
            Re: Everything you did not want to know about Unicode in Python 3 Johannes Bauer <dfnsonfsduifb@gmx.de> - 2014-05-13 11:38 +0200
          Re: Everything you did not want to know about Unicode in Python 3 Johannes Bauer <dfnsonfsduifb@gmx.de> - 2014-05-13 11:46 +0200
            Re: Everything you did not want to know about Unicode in Python 3 Marko Rauhamaa <marko@pacujo.net> - 2014-05-13 12:59 +0300
          Re: Everything you did not want to know about Unicode in Python 3 Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-05-13 14:30 +0100
          Re: Everything you did not want to know about Unicode in Python 3 Chris Angelico <rosuav@gmail.com> - 2014-05-13 23:37 +1000
          Re: Everything you did not want to know about Unicode in Python 3 Skip Montanaro <skip@pobox.com> - 2014-05-13 09:02 -0500
        Re: Everything you did not want to know about Unicode in Python 3 wxjmfauth@gmail.com - 2014-05-14 00:00 -0700
      Re: Everything you did not want to know about Unicode in Python 3 alister <alister.nospam.ware@ntlworld.com> - 2014-05-13 11:19 +0000
        Re: Everything you did not want to know about Unicode in Python 3 Ian Kelly <ian.g.kelly@gmail.com> - 2014-05-13 10:08 -0600
          Re: Everything you did not want to know about Unicode in Python 3 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-05-14 00:10 +0000
            Re: Everything you did not want to know about Unicode in Python 3 Ethan Furman <ethan@stoneleaf.us> - 2014-05-13 17:53 -0700
            Re: Everything you did not want to know about Unicode in Python 3 Terry Reedy <tjreedy@udel.edu> - 2014-05-14 17:47 -0400
            Re: Everything you did not want to know about Unicode in Python 3 Antoine Pitrou <antoine@python.org> - 2014-05-16 11:50 +0000
              Re: Everything you did not want to know about Unicode in Python 3 wxjmfauth@gmail.com - 2014-05-16 06:20 -0700
          Re: Everything you did not want to know about Unicode in Python 3 alister <alister.nospam.ware@ntlworld.com> - 2014-05-14 12:38 +0000
        Re: Everything you did not want to know about Unicode in Python 3 Robin Becker <robin@reportlab.com> - 2014-05-14 16:30 +0100
        Re: Everything you did not want to know about Unicode in Python 3 Ian Kelly <ian.g.kelly@gmail.com> - 2014-05-14 09:56 -0600

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