Why can't slice use non-int. indices?

[Ben Wolfson]

In article <3B168CF7.F44777F9 at yahoo.com>, "Paul Winkler"
<slinkp23 at yahoo.com> wrote:

> This is on python 2.1.
> 
>>>> a = []
>>>> a[3:4]
> []
>>>> a[3.2: 4]
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> TypeError: slice indices must be integers

For that matter, why doesn't this work?

>>> lst = range(10)
>>> slc = slice(2,6)
>>> lst[slc]
Traceback (most recent call last):
  File "<pyshell#2>", line 1, in ?
    lst[slc]
TypeError: sequence index must be integer

Seems like it ought to.

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