[issue3004] Bug in slice.indices()

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> 0 <= start <= stop <= length    if step is positive, and
> length-1 >= start >= stop >= -1 if step is negative.

That should be:

0 <= start <= length and 0 <= stop <= length  (step > 0), and
length-1 >= start >= -1, length-1 >= stop >= -1 (step < 0);

it's not guaranteed that start <= stop always holds in the first case,
or that start >= stop in the second.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3004>
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