[Python-3000] Removing 'old-style' ('simple') slices from Py3K.

[Nick Coghlan]

Thomas Wouters wrote:
>  - There's no way to figure out the size of a Py_ssize_t from Python 
> code, now. test_support was using a simple-slice to figure it out. I'm 
> not sure if there's really a reason to do it -- I don't quite understand 
> the use of it.

This isn't quite true, but I will admit that the only way I know how to do it 
is somewhat on the arcane side ;)

   try:
     double_width = 2*(sys.maxint+1)**2-1
     slice(None).indices(double_width)
     pyssize_t_max = double_width          # ssize_t twice as wide as long
   except OverflowError:
     pyssize_t_max = sys.maxint            # ssize_t same width as long

It might make more sense to just include a "sys.maxindex" to parallel 
sys.maxint (even though both are technically misnomers, leaving out the 
'native' bit).

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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