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Re: "Decoding unicode is not supported" in unusual situation

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John Nagle <nagle@animats.com> writes:

>    The library bug, if any, is that you can't apply
>
> 	unicode(s, errors='replace')
>
> to a Unicode string. TypeError("Decoding unicode is not supported") is
> raised.  However
>
>   	unicode(s)
>
> will accept Unicode input.

I think that's a Python bug. If the latter succeeds as a no-op, the
former should also succeed as a no-op. Neither should ever get any
errors when ‘s’ is a ‘unicode’ object already.

> The Python documentation
> ("http://docs.python.org/library/functions.html#unicode") does not
> mention this. It is therefore necessary to check the type before
> calling "unicode", or catch the undocumented TypeError exception
> afterward.

Yes, this check should not be necessary; calling the ‘unicode’
constructor with an object that's already an instance of ‘unicode’
should just return the object as-is, IMO. It shouldn't matter that
you've specified how decoding errors are to be handled, because in that
case no decoding happens anyway.

Care to report that bug to <URL:http://bugs.python.org/>, John?

-- 
 \          “Those who write software only for pay should go hurt some |
  `\                 other field.” —Erik Naggum, in _gnu.misc.discuss_ |
_o__)                                                                  |
Ben Finney

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Thread

"Decoding unicode is not supported" in unusual situation John Nagle <nagle@animats.com> - 2012-03-07 00:25 -0800
  Re: "Decoding unicode is not supported" in unusual situation deets@web.de (Diez B. Roggisch) - 2012-03-07 11:20 +0100
    Re: "Decoding unicode is not supported" in unusual situation Ben Finney <ben+python@benfinney.id.au> - 2012-03-07 22:18 +1100
      Re: "Decoding unicode is not supported" in unusual situation Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-07 11:42 +0000
        Re: "Decoding unicode is not supported" in unusual situation John Nagle <nagle@animats.com> - 2012-03-07 11:25 -0800
          Re: "Decoding unicode is not supported" in unusual situation Ben Finney <ben+python@benfinney.id.au> - 2012-03-08 08:48 +1100
            Re: "Decoding unicode is not supported" in unusual situation Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-07 23:26 +0000
              Re: "Decoding unicode is not supported" in unusual situation Terry Reedy <tjreedy@udel.edu> - 2012-03-07 19:03 -0500
              Re: "Decoding unicode is not supported" in unusual situation Ben Finney <ben+python@benfinney.id.au> - 2012-03-08 13:18 +1100
                Re: "Decoding unicode is not supported" in unusual situation John Nagle <nagle@animats.com> - 2012-03-08 14:23 -0800
                RE: "Decoding unicode is not supported" in unusual situation "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-03-08 22:58 +0000
                Re: "Decoding unicode is not supported" in unusual situation John Nagle <nagle@animats.com> - 2012-03-09 10:11 -0800
                Re: "Decoding unicode is not supported" in unusual situation Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-10 00:57 +0000
                Re: "Decoding unicode is not supported" in unusual situation John Nagle <nagle@animats.com> - 2012-03-10 22:12 -0800
                Re: "Decoding unicode is not supported" in unusual situation Neil Cerutti <neilc@norwich.edu> - 2012-03-09 13:23 +0000

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