[C++-sig] GNU gettext and "_"

[David Abrahams]

----- Original Message -----
From: "Pearu Peterson" <pearu at cens.ioc.ee>

> > > "Obvious" to me would be to use the same convention as used in Python
> > > slice object, that is,
> > >
> > >   x[:y]   would be x.slice(None,y)
> > >   x[:y:]  would be x.slice(None,y,None)
> > >   etc.
> >
> > Unfortunately not equivalent.
>
> Read the source code.

I have. Which source are you looking at?

see ceval.c: apply_slice()/assign_slice()

> > >>> range(10)[slice(None:3)]
> > Traceback (most recent call last):
> >   File "<stdin>", line 1, in ?
> > TypeError: sequence index must be integer
>
> This example is nonsense. First
>   slice(None:3)
> gives syntax error, and second also
>   range(10)[slice(1:3)]
> gives
>   TypeError: sequence index must be integer
> because index of a list *must* be integer, not a slice or anything else.

Uh, sorry, I meant:

>>> range(10)[slice(None,3)]
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: sequence index must be integer

Anyway:

>>> range(10).__getslice__(None,3)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: an integer is required

So, really, I'm not kidding: None is not a substitute for () where slicing
is concerned.

-Dave