__getitem__, __getslice__ question for python 2.2

[Just van Rossum]

In article <mailman.1021446748.5956.python-list at python.org>,
 Ken Seehof <kseehof at neuralintegrator.com> wrote:

> I don't see the problem.  If x is 'a', x != int(x) evaluates to false,
> consistent with 'a' not being an integer.

  >>> x = 'a'
  >>> x != int(x)
  Traceback (most recent call last):
    File "<stdin>", line 1, in ?
  ValueError: invalid literal for int(): a
  >>> 

> If x is 2.0, the expression evaluates to true.  People will argue
> about whether or not this is correct.  It may or may not be correct,
> depending on why you want to constrain x to an integer.  In many
> cases it is appropriate to consider 2.0 to be an integer.  It depends
> on the context.

  >>> range(5)[2.0]
  Traceback (most recent call last):
    File "<stdin>", line 1, in ?
  TypeError: sequence index must be integer
  >>> 

Just