results=[[1,2,3,4,5], [11,22,33,44,55], [111,222,333,444,555]] #results2=results.copy() results2=results[:] results2[2][0]='A' results2[2][1]='B' results2[2][2]='C' print(results, results2)Using .copy() and [:], data in the original list is also changed when I changed the data in the copied list.
How can I have 2 independent copied lists?
Thanks.
P/S Found the answer.
import copy #lst_copy = copy.deepcopy(lst) #results2=results.copy() results2=copy.deepcopy(results) results2[2][0]='A' results2[2][1]='B' results2[2][2]='C' print(results, results2)What is the benefit in making a copy and changing the copied will change the original? Wish that it is just like normal copy.