Extended slicing and Ellipsis - where are they used?

[Rodney Maxwell]

The following are apparently legal Python syntactically:
L[1:3, 8:10]
L[1, ..., 5:-2]

But they don't seem to work on lists:

>>l = [0,1,2,3]
l[0:2,3]

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: list indices must be integers

>>l[...]

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: list indices must be integers

So where is this extended slicing used?

--
Rodney

[Robert Kern]

Rodney Maxwell wrote:

The following are apparently legal Python syntactically:
L[1:3, 8:10]
L[1, ..., 5:-2]

But they don't seem to work on lists:

>>>l = [0,1,2,3]
l[0:2,3]

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: list indices must be integers

>>>l[...]

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: list indices must be integers

So where is this extended slicing used?

numpy for multidimensiona l arrays.

http://numpy.scipy.org/

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco