Python | How to copy a nested list
In the previous article, we have seen how to clone or Copy a list, now let’s see how to copy a nested list in Python.
Method #1: Using Iteration
# Python program to copy a nested list # List initializationInput_list = [[0, 1, 2], [3, 4, 5], ]Output = [] # Using iteration to assign valuesfor x in range(len(Input_list)): temp = [] for elem in Input_list[x]: temp.append(elem) Output.append(temp) # Printing Outputprint("Initial list is:")print(Input_list)print("New assigned list is")print(Output) |
Output:
Initial list is: [[0, 1, 2], [3, 4, 5]] New assigned list is [[0, 1, 2], [3, 4, 5]]
Method #2: Using deepcopy
# Python program to copy a nested listimport copy # List initializationInput = [[1, 0, 1], [1, 0, 1]] # using deepcopyOutput = copy.deepcopy(Input) # Printingprint("Initial list is:")print(Input)print("New assigned list is")print(Output) |
Output:
Initial list is: [[1, 0, 1], [1, 0, 1]] New assigned list is [[1, 0, 1], [1, 0, 1]]
Method #3: Using list comprehension and slicing
# Python program to copy a nested list # List initializationInput_list = [[0,1,2], [3,4,5], [0, 1, 8]] # comprehensive methodout_list = [ele[:] for ele in Input_list] # Printing Outputprint("Initial list is:")print(Input_list)print("New assigned list is")print(out_list) |
Output:
Initial list is: [[0, 1, 2], [3, 4, 5], [0, 1, 8]] New assigned list is [[0, 1, 2], [3, 4, 5], [0, 1, 8]]
