On Thu, Nov 26, 2020 at 01:27:46PM +1300, Greg Ewing wrote:
> On 26/11/20 12:41 pm, Steven D'Aprano wrote:
> > a = "abcdef"
> > a[-2] # returns a result
>
> Yes, but did you *intend* that result, or did the -2
> result from a calculation that should have returned a
> positive index but we
Hello,
On Thu, 26 Nov 2020 13:27:46 +1300
Greg Ewing wrote:
> On 26/11/20 12:41 pm, Steven D'Aprano wrote:
> > a = "abcdef"
> > a[-2] # returns a result
>
> Yes, but did you *intend* that result, or did the -2
> result from a calculation that should have returned a
> positive index
On 26/11/20 12:41 pm, Steven D'Aprano wrote:
a = "abcdef"
a[-2] # returns a result
Yes, but did you *intend* that result, or did the -2
result from a calculation that should have returned a
positive index but went wrong? Python has no way to
tell.
--
Greg
___
On 11/25/2020 6:41 PM, Steven D'Aprano wrote:
On Thu, Nov 26, 2020 at 12:07:56PM +1300, Greg Ewing wrote:
On 26/11/20 2:30 am, nathan.w.edwa...@outlook.com wrote:
At times I heavily rely on index out of bound exceptions to reduce the
number of lines necessary for error checking.
This is a do
On Wed, Nov 25, 2020 at 3:44 PM Steven D'Aprano wrote:
> Obviously you can tell the two apart, so I'm confused by your comment.
>
What I imagined while reading Greg's comment was trying to explain to a
student why this didn't work the way they expected. "Ok, so in the first
case I'm *not* start
On Thu, Nov 26, 2020 at 12:07:56PM +1300, Greg Ewing wrote:
> On 26/11/20 2:30 am, nathan.w.edwa...@outlook.com wrote:
> >At times I heavily rely on index out of bound exceptions to reduce the
> >number of lines necessary for error checking.
>
> This is a downside to the negative indexing scheme
On 26/11/20 2:30 am, nathan.w.edwa...@outlook.com wrote:
At times I heavily rely on index out of bound exceptions to reduce the
number of lines necessary for error checking.
This is a downside to the negative indexing scheme -- you
can't tell the difference between a backwards index and an
erro
The power in programming is the simplicity in keyword and instruction function, I do believe. As much as I love the concept, I feel the use of a data structure to handle such cases circular indexing is needed is more appropriate than changing loop statement behavior.At times I heavily rely on index
25.11.20 06:29, Mathew M. Noel via Python-ideas пише:
> 2.) If circular indexing is used then instead of using a double FOR loop
> to go through a loop twice we can iterate from 0 to 2n !
If you just need to iterate list indices twice, iterate range(-n, n)
instead of range(n).
Hi Mathew, welcome!
My responses interleaved with your comments.
On Wed, Nov 25, 2020 at 04:29:17AM +, Mathew M. Noel via Python-ideas wrote:
> As discussed earlier on the post on 'Circular Indexing', considering
> interpreting indices that lie outside the range 0 to n-1 modulo n for
> li
Hello,
On Tue, 24 Nov 2020 19:36:03 +
"Mathew M. Noel via Python-ideas" wrote:
> Python uses an index of -1 to index the last element in a list. Since
> -1 occurs before 0 we might think of the elements of the linear list
> are being bent into a circle making the last element occur before th
On 11/24/20 2:36 PM, Mathew M. Noel via Python-ideas wrote:
>
> Python uses an index of -1 to index the last element in a list. Since
> -1 occurs before 0 we might think of the elements of the linear list
> are being bent into a circle making the last element occur before the
> 0th element. Conside
I believe this would be simple to implement when it's needed by subclassing
`collections.UserList` and wrapping this functionality around
`__getitem__`, `__setitem__`, and `__delitem__`.
On Tue, Nov 24, 2020, 2:38 PM Mathew M. Noel via Python-ideas <
python-ideas@python.org> wrote:
> Python uses
November 24, 2020 2:36 PM, "Mathew M. Noel via Python-ideas"
mailto:python-ideas@python.org?to=%22Mathew%20M.%20Noel%20via%20Python-ideas%22%20)>
wrote:
[snip]
This feature can prove to be extremely useful. It can also prove to be
extremely dangerous. "list index out of range" errors can
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