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

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Date Wed, 25 May 2011 22:52:39 +0100
From MRAB <python@mrabarnett.plus.com>
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On 25/05/2011 21:54, Ian Kelly wrote:
> 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.

What do you mean by "may include the decoder state in its return value"?

It does make sense that the values returned from tell() won't be in the
middle of an encoded sequence of bytes.

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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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