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Groups > comp.lang.python > #6262

Re: Python 3.2 bug? Reading the last line of a file

References <3d81e2a0-6c86-4f12-a1c4-ce4c736172b6@y31g2000vbp.googlegroups.com> <4DDD5FD2.8040607@mrabarnett.plus.com>
From Ian Kelly <ian.g.kelly@gmail.com>
Date 2011-05-25 14:54 -0600
Subject Re: Python 3.2 bug? Reading the last line of a file
Newsgroups comp.lang.python
Message-ID <mailman.2093.1306356898.9059.python-list@python.org> (permalink)

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On Wed, May 25, 2011 at 2:00 PM, MRAB <python@mrabarnett.plus.com> wrote:
> You're opening the file in text mode, and seeking relative to the end
> of the file is not allowed in text mode, presumably because the file
> contents have to be decoded, and, in general, seeking to an arbitrary
> position within a sequence of encoded bytes can have undefined results
> when you attempt to decode to Unicode starting from that position.
>
> The strange thing is that you _are_ allowed to seek relative to the
> start of the file.

I think that with text files seek() is only really meant to be called
with values returned from tell(), which may include the decoder state
in its return value.

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Thread

Python 3.2 bug? Reading the last line of a file "tkpmep@hotmail.com" <tkpmep@hotmail.com> - 2011-05-25 12:33 -0700
  Re: Python 3.2 bug? Reading the last line of a file MRAB <python@mrabarnett.plus.com> - 2011-05-25 21:00 +0100
  Re: Python 3.2 bug? Reading the last line of a file Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-25 14:54 -0600
  Re: Python 3.2 bug? Reading the last line of a file MRAB <python@mrabarnett.plus.com> - 2011-05-25 22:52 +0100
    Re: Python 3.2 bug? Reading the last line of a file "tkpmep@hotmail.com" <tkpmep@hotmail.com> - 2011-05-25 16:25 -0700
      Re: Python 3.2 bug? Reading the last line of a file Ethan Furman <ethan@stoneleaf.us> - 2011-05-25 16:58 -0700
      Re: Python 3.2 bug? Reading the last line of a file MRAB <python@mrabarnett.plus.com> - 2011-05-26 00:56 +0100
      Re: Python 3.2 bug? Reading the last line of a file Ethan Furman <ethan@stoneleaf.us> - 2011-05-25 17:32 -0700
      Re: Python 3.2 bug? Reading the last line of a file Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2011-05-26 08:09 +0300
        Re: Python 3.2 bug? Reading the last line of a file "tkpmep@hotmail.com" <tkpmep@hotmail.com> - 2011-05-27 12:21 -0700
  Re: Python 3.2 bug? Reading the last line of a file Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-25 19:06 -0600

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