insertion sorts...

A.T.Hofkamp hat at se-162.se.wtb.tue.nl
Wed Jun 25 12:37:43 CEST 2008


On 2008-06-25, python_newbie <serbulentu at gmail.com> wrote:
> On 24 Haziran, 04:33, Terry Reedy <tjre... at udel.edu> wrote:
> Thanks for all answers. At the end i ve only one point. If a decide to
> copy list to iterate when will i have to do this ? Before the
> iteration ? And then iterate through one list and change value of the
> other ?

Before starting the iteration would be a good point....

I usually do in such cases:

for x in mylist[:]:
   ...

making a copy just before the for loop starts.


Lately, I have started avoiding in-place modification of lists. Instead, I
construct a new list from scratch inside the for-loop, and replace the old list
with the newly constructed list afterwards like:

new_list = []
for x in mylist:
   ....
   new_list.append(x)

mylist = new_list

by appending a different value than the original or by not appending, you can
influence the contents of the new list.

I find this solution nicer than in-place modification of an existing list.


Sincerely,
Albert



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