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Extended slicing and Ellipsis - where are they used?

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

Sep 13 '07 #1
1 2109
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 multidimensional 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

Sep 13 '07 #2

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