On Fri, Mar 4, 2011 at 5:26 PM, MRAB <pyt...@mrabarnett.plus.com> wrote:
>> UnsupportedOperation: can't do non-zero end-relative seeks
>>
>> But offset is initialized to -10. Does anyone have any thoughts on
>> what the error might be caused by?
>>
> I think it's because the file has been opened in text mode, so there's
> the encoding to consider. It may be that it's to stop you from
> accidentally seeking into the middle of a multibyte sequence, but
> there's nothing to stop you doing that when seeking relative to the
> start, for example, so it's possibly a pointless restriction.
I expect that's correct. The doc string from Python 2 included this nugget:
If the file is opened in text mode, only offsets returned by
tell() are legal.
Use of other offsets causes undefined behavior.
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