[Python-3000] Universal newlines support in Python 3.0

[Stephen J. Turnbull]

Greg Ewing writes:

 > Guido van Rossum wrote:
 > > However, the old universal newlines feature also set an attibute named
 > > 'newlines' on the file object to a tuple of up to three elements
 > > giving the actual line endings that were observed on the file so far
 > > (\r, \n, or \r\n).
 > 
 > I've never used it, but I can see how it could be
 > useful, e.g. if you're implementing a text editor
 > that wants to be able to save the file back in
 > the same format it had before.

But if there's more than one line ending used, that's not good
enough.  Universal newlines is a wonderful convenience for most text
usage, but if you really need to be able to preserve format, it's not
going to be enough.

I think it's best for universal newlines to be simple.  Let fancy
facilities be provided by a library wrapping raw IO, as you suggest.