Remove elements from a list, while other list doesn't reset

Question

I'm currently stuck at this problem, so i have this code.

     rij1 = rij2
     rij2.clear()

All works correct, but in the end of the loop is a problem. Rij1 also gets cleared because apparently, python remembers rij1 = rij2 Is there any way to prevent this?

This variable names are not optimized for readability i guess ... — SchreiberLex, Dec 20 '16 at 15:24

Moinuddin Quadri · Accepted Answer · 2016-12-20T15:17:33.773

2

rij1 = rij2 stores the same reference of list at rij2 to rij1. For storing the new copy of list, you should do:

rij1 = rij2[:]

# OR
rij1 = list(rij2)

Also, you may use copy.copy to create shallow copy of list as:

from copy import copy

rij1 = copy(rij2)

edited Dec 20 '16 at 15:17

answered Dec 20 '16 at 15:15

Moinuddin Quadri

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Thank you so much! – Eric mansen Dec 20 '16 at 15:16

score 1 · Answer 2 · answered Dec 20 '16 at 15:16

1

You need to make a copy of the list. After rij1 = rij2, both variables are names for the same list.

Something like

rij1 = rij2[:]

will work.

answered Dec 20 '16 at 15:16

RemcoGerlich

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Remove elements from a list, while other list doesn't reset

2 Answers2