[Python-Dev] Revised PEP 349: Allow str() to return unicode strings
nas at arctrix.com
Thu Aug 25 19:03:32 CEST 2005
On Wed, Aug 24, 2005 at 09:11:18PM +0200, Dieter Maurer wrote:
> Neil Schemenauer <nas at arctrix.com> writes on Mon, 22 Aug 2005 15:31:42 -0600:
> > The code was fixed by changing
> > the line "header = str(header)" to:
> > if isinstance(header, unicode):
> > header = header.encode('ascii')
> Note, that this is not equivalent to the old "str(header)":
> "str(header)" used Python's "default encoding" while the
> new code uses 'ascii'.
It also doesn't call __str__ if the object is not a basestring
instance. I have a hard time understanding the exact purpose of
calling str() here. Maybe Barry can comment.
> Can we get a new builtin with the exact same behaviour as
> the current "str" which can be used when we do require an "str"
> (and cannot use a "unicode").
That fact that no code in the standard library requires such a
function (AFAIK), leads me to believe that it would not be useful
enough to be made a built-in. You would just write it yourself:
s = str(s)
if isinstance(s, unicode):
s = s.encode(sys.getdefaultencoding())
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