[Python-ideas] Where did we go wrong with negative stride?

[Oscar Benjamin]

On 27 October 2013 18:32, Guido van Rossum <guido at python.org> wrote:
>
> Hm, so the idea is that with a negative stride you you should use negative
> indices.

The same problem arises when using a negative indices and a positive
stride e.g.:

# Chop off last n elements
x_chopped = x[:-n]  # Fails when n == 0

The solution is to use a positive end condition:

x_chopped = x[:len(x)+1-n]


Oscar