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Date: Wed, 28 Aug 2013 10:01:41 +0200
From: Kurt Mueller <kurt.alfred.mueller@gmail.com>
Organization: Rothenburg
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To: python-list@python.org
Subject: Re: right adjusted strings containing umlauts
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Am 08.08.2013 18:37, schrieb Chris Angelico:
> On Thu, Aug 8, 2013 at 5:16 PM, Kurt Mueller
> <kurt.alfred.mueller@gmail.com> wrote:
>> Am 08.08.2013 17:44, schrieb Peter Otten:
>>> Kurt Mueller wrote:
>>>> What do I do, when input_strings/output_list has other codings like
>>>> iso-8859-1?
>>> You have to know the actual encoding. With that information it's easy:
>>>>>> output_list
>>> ['\xc3\xb6', '\xc3\xbc', 'i', 's', 'f']
>>>>>> encoding = "utf-8"
>>>>>> output_list = [s.decode(encoding) for s in output_list]
>>>>>> print output_list
>>> [u'\xf6', u'\xfc', u'i', u's', u'f']
>> How do I get to know the actual encoding?
>> I read from stdin. There can be different encondings.
>> Usually utf8 but also iso-8859-1/latin9 are to be expected.
>> But sys.stdin.encoding sais always 'None'.
> 
> If you can switch to Python 3, life becomes a LOT easier. The Python 3
> input() function (which does the same job as raw_input() from Python
> 2) returns a Unicode string, meaning that it takes care of encodings
> for you.

Because I cannot switch to Python 3 for now my life is not so easy:-)

For some text manipulation tasks I need a template to split lines
from stdin into a list of strings the way shlex.split() does it.
The encoding of the input can vary.
For further processing in Python I need the list of strings to be in unicode.

Here is template.py:

##############################################################################################################
#!/usr/bin/env python
# vim: set fileencoding=utf-8 :
# split lines from stdin into a list of unicode strings
# Muk 2013-08-23
# Python 2.7.3

from __future__ import print_function
import sys
import shlex
import chardet

bool_cmnt = True  # shlex: skip comments
bool_posx = True  # shlex: posix mode (strings in quotes)

for inpt_line in sys.stdin:
    print( 'inpt_line=' + repr( inpt_line ) )
    enco_type = chardet.detect( inpt_line )[ 'encoding' ]           # {'encoding': 'EUC-JP', 'confidence': 0.99}
    print( 'enco_type=' + repr( enco_type ) )
    try:
        strg_inpt = shlex.split( inpt_line, bool_cmnt, bool_posx, ) # shlex does not work on unicode
    except Exception, errr:                                         # usually 'No closing quotation'
        print( "error='%s' on inpt_line='%s'" % ( errr, inpt_line.rstrip(), ), file=sys.stderr, )
        continue
    print( 'strg_inpt=' + repr( strg_inpt ) )                       # list of strings
    strg_unic = [ strg.decode( enco_type ) for strg in strg_inpt ]  # decode the strings into unicode
    print( 'strg_unic=' + repr( strg_unic ) )                       # list of unicode strings
##############################################################################################################

$ cat <some-file> | template.py


Comments are welcome.


TIA
-- 
Kurt Mueller

-- 
Kurt Mueller