Re: Changing filenames from Greeklish => Greek (subprocess complain)

From	Lele Gaifax <lele@metapensiero.it>
Subject	Re: Changing filenames from Greeklish => Greek (subprocess complain)
Date	2013-06-09 10:55 +0200
Organization	Nautilus Entertainments
References	(1 earlier) <20130608024931.GA77888@cskk.homeip.net> <51B37173.9060601@gmail.com> <mailman.2894.1370719010.3114.python-list@python.org> <3fbb5d0e-51fb-4aed-b829-8388304a9885@googlegroups.com> <51b4249d$0$30001$c3e8da3$5496439d@news.astraweb.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.2910.1370768144.3114.python-list@python.org> (permalink)

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Steven D'Aprano <steve+comp.lang.python@pearwood.info> writes:

> On Sat, 08 Jun 2013 22:09:57 -0700, nagia.retsina wrote:
>
>> chr('A') would give me the mapping of this char, the number 65 while
>> ord(65) would output the char 'A' likewise.
>
> Correct. Python uses Unicode, where code-point 65 ("ordinal value 65") 
> means letter "A".

Actually, that's the other way around:

    >>> chr(65)
    'A'
    >>> ord('A')
    65

>> What would happen if we we try to re-encode bytes on the disk? like
>> trying:
>> 
>> s = "νίκος"
>> utf8_bytes = s.encode('utf-8')
>> greek_bytes = utf_bytes.encode('iso-8869-7')
>> 
>> Can we re-encode twice or as many times we want and then decode back
>> respectively lke?
>
> Of course. Bytes have no memory of where they came from, or what they are 
> used for. All you are doing is flipping bits on a memory chip, or on a 
> hard drive. So long as *you* remember which encoding is the right one, 
> there is no problem. If you forget, and start using the wrong one, you 
> will get garbage characters, mojibake, or errors.

Uhm, no: "encode" transforms a Unicode string into an array of bytes,
"decode" does the opposite transformation. You cannot do the former on
an "arbitrary" array of bytes:

    >>> s = "νίκος"
    >>> utf8_bytes = s.encode('utf-8')
    >>> greek_bytes = utf8_bytes.encode('iso-8869-7')
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    AttributeError: 'bytes' object has no attribute 'encode'

ciao, lele.
-- 
nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri
real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia.
lele@metapensiero.it  |                 -- Fortunato Depero, 1929.

Thread

Re: Changing filenames from Greeklish => Greek (subprocess complain) Cameron Simpson <cs@zip.com.au> - 2013-06-07 18:53 +1000
  Re: Changing filenames from Greeklish => Greek (subprocess complain) alex23 <wuwei23@gmail.com> - 2013-06-07 02:41 -0700
  Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-07 04:53 -0700
    Re: Changing filenames from Greeklish => Greek (subprocess complain) MRAB <python@mrabarnett.plus.com> - 2013-06-07 15:29 +0100
      Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-07 11:52 -0700
        Re: Changing filenames from Greeklish => Greek (subprocess complain) Zero Piraeus <schesis@gmail.com> - 2013-06-07 15:31 -0400
        Re: Changing filenames from Greeklish => Greek (subprocess complain) MRAB <python@mrabarnett.plus.com> - 2013-06-07 21:45 +0100
        Re: Changing filenames from Greeklish => Greek (subprocess complain) Zero Piraeus <schesis@gmail.com> - 2013-06-07 19:24 -0400
        Re: Changing filenames from Greeklish => Greek (subprocess complain) Cameron Simpson <cs@zip.com.au> - 2013-06-08 12:52 +1000
          Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-07 23:49 -0700
            Re: Changing filenames from Greeklish => Greek (subprocess complain) Chris Angelico <rosuav@gmail.com> - 2013-06-08 16:58 +1000
            Re: Changing filenames from Greeklish => Greek (subprocess complain) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-08 07:26 +0000
              Re: Changing filenames from Greeklish => Greek (subprocess complain) Chris Angelico <rosuav@gmail.com> - 2013-06-08 17:40 +1000
            Re: Changing filenames from Greeklish => Greek (subprocess complain) MRAB <python@mrabarnett.plus.com> - 2013-06-08 17:32 +0100
              Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-08 09:53 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-08 10:35 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) MRAB <python@mrabarnett.plus.com> - 2013-06-08 18:48 +0100
    Re: Changing filenames from Greeklish => Greek (subprocess complain) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-07 15:33 +0000
    Re: Changing filenames from Greeklish => Greek (subprocess complain) Cameron Simpson <cs@zip.com.au> - 2013-06-08 12:49 +1000
    Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-08 21:01 +0300
      Re: Changing filenames from Greeklish => Greek (subprocess complain) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-08 19:01 +0000
        Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-08 14:14 -0700
          Re: Changing filenames from Greeklish => Greek (subprocess complain) Cameron Simpson <cs@zip.com.au> - 2013-06-09 08:32 +1000
          Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 07:46 +0300
            Re: Changing filenames from Greeklish => Greek (subprocess complain) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-09 06:25 +0000
              Re: Changing filenames from Greeklish => Greek (subprocess complain) Cameron Simpson <cs@zip.com.au> - 2013-06-09 18:02 +1000
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 02:03 -0700
        Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-08 14:21 -0700
          Re: Changing filenames from Greeklish => Greek (subprocess complain) Chris Angelico <rosuav@gmail.com> - 2013-06-09 08:10 +1000
        Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 01:11 -0700
    Re: Changing filenames from Greeklish => Greek (subprocess complain) Chris Angelico <rosuav@gmail.com> - 2013-06-09 04:47 +1000
      Re: Changing filenames from Greeklish => Greek (subprocess complain) nagia.retsina@gmail.com - 2013-06-08 22:09 -0700
        Re: Changing filenames from Greeklish => Greek (subprocess complain) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-09 06:45 +0000
          Re: Changing filenames from Greeklish => Greek (subprocess complain) nagia.retsina@gmail.com - 2013-06-09 00:00 -0700
            Re: Changing filenames from Greeklish => Greek (subprocess complain) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-09 08:15 +0000
              Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 02:14 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 03:32 -0700
              Re: Changing filenames from Greeklish => Greek (subprocess complain) Cameron Simpson <cs@zip.com.au> - 2013-06-09 19:16 +1000
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-09 12:36 +0000
                Re: Changing filenames from Greeklish => Greek (subprocess complain) nagia.retsina@gmail.com - 2013-06-09 10:25 -0700
          Re: Changing filenames from Greeklish => Greek (subprocess complain) Lele Gaifax <lele@metapensiero.it> - 2013-06-09 10:55 +0200
            Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 02:08 -0700
              Re: Changing filenames from Greeklish => Greek (subprocess complain) Lele Gaifax <lele@metapensiero.it> - 2013-06-09 11:20 +0200
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 02:38 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Andreas Perstinger <andipersti@gmail.com> - 2013-06-09 14:24 +0200
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-09 13:13 +0000
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Benjamin Kaplan <benjamin.kaplan@case.edu> - 2013-06-09 13:05 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 02:42 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 03:37 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Larry Hudson <orgnut@yahoo.com> - 2013-06-10 00:51 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-10 01:11 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Larry Hudson <orgnut@yahoo.com> - 2013-06-11 00:20 -0700
            Re: Changing filenames from Greeklish => Greek (subprocess complain) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-09 11:50 +0000
              Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 05:18 -0700
          Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 02:00 -0700
            Re: Changing filenames from Greeklish => Greek (subprocess complain) Cameron Simpson <cs@zip.com.au> - 2013-06-09 19:12 +1000
              Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-09 02:20 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Benjamin Kaplan <benjamin.kaplan@case.edu> - 2013-06-09 13:01 -0700
            Re: Changing filenames from Greeklish => Greek (subprocess complain) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-09 12:31 +0000
              Re: Changing filenames from Greeklish => Greek (subprocess complain) nagia.retsina@gmail.com - 2013-06-10 00:10 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Andreas Perstinger <andipersti@gmail.com> - 2013-06-10 10:15 +0200
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-10 01:54 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-10 02:59 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Andreas Perstinger <andipersti@gmail.com> - 2013-06-10 12:42 +0200
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-10 11:59 +0000
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Νικόλαος Κούρας <nikos.gr33k@gmail.com> - 2013-06-10 07:27 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) jmfauth <wxjmfauth@gmail.com> - 2013-06-10 12:48 -0700
                Re: Changing filenames from Greeklish => Greek (subprocess complain) Ned Batchelder <ned@nedbatchelder.com> - 2013-06-10 13:28 -0700

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