[Python-3000] StringIO/BytesIO in io.py doesn't over-seek properly

[Guido van Rossum]

Unless anyone cares, it should imply a seek to the indicated position
if an argument was present.

On 7/18/07, Alexandre Vassalotti <alexandre at peadrop.com> wrote:
> So, any decision on the proposed semantic change of truncate?
>
> -- Alexandre
>
> On 7/3/07, Alexandre Vassalotti <alexandre at peadrop.com> wrote:
> > On 7/2/07, Guido van Rossum <guido at python.org> wrote:
> > > Honestly, I think truncate() should always set the current position to
> > > the new size, even though that's not what it currently does.
> >
> > Thought about that and I think that would be the best thing to do.
> > That would avoid making StringIO unnecessary different from BytesIO.
> > And IMHO, it is less prone to bugs. If someone wants to truncate while
> > keeping the current position, then he will have to state is intention
> > explicitly by saving the value of tell() and calling seek() after
> > truncating.
> >
> > I also find the semantic make more sense too. For example:
> >
> >    >>> s = StringIO("Good bye, world")
> >    >>> s.truncate(10)
> >    >>> s.write("cruel world")
> >    >>> s.getvalue()
> >    ???
> >
> > I think that should return "Good bye, cruel world", not "cruel world".
> >
> > So, does anyone else agree with this small semantic change of truncate()?
> >
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-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)