On 2021-03-05 at 16:27:27 -0000,
Vincent Cheong <vincentcheong6...@gmail.com> wrote:
> Currently, list.reverse() only works for an entire list. If one wants
> to reverse a section of it 'in-place', one needs to slicing which
> makes the space complexity no longer O(1). One can also manually make
> a loop and do the reversal but that is even slower than
> slicing. List.reverse() does not take any arguments. Wouldn't it be a
> good if it can take in parameters such as 'start' and 'stop' to enable
> list.reverse() work even for a section of the list? When no arguments
> are specified, then it works on the whole list, like usual.
Try this:
def slice_reverse(the_list, start, stop):
the_list[start:stop] = the_list[stop - 1, start - 1, -1]
I'll defer on whether or not this deserves a place in the standard
library; the older I get, the more I prefer building new data than
mutating existing data.
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