python deep copy

# deep copy example in python
import copy

old_list = [[1, 1, 1], [2, 2, 2], [3, 3, 3]]
new_list = copy.deepcopy(old_list)

old_list[1][0] = 'BB'

print("Old list:", old_list)
print("New list:", new_list)

# OUTPUT
Old list: [[1, 1, 1], ['BB', 2, 2], [3, 3, 3]]
New list: [[1, 1, 1], [2, 2, 2], [3, 3, 3]]

# importing copy module 
import copy 
  
# initializing list 1  
li1 = [1, 2, [3,5], 4] 
  
  
# using copy for shallow copy   
li2 = copy.copy(li1)  
  
# using deepcopy for deepcopy   
li3 = copy.deepcopy(li1)