medium1_shallow_deep4.md

l1 = [[10,20,30], 1, 2, 3]# a list with another list at index 0
l2 = list(l1)             # create a copy

l1.append(4)              # append to list l1
l1[0].append(40)          # modify the inner list of l1

print( id(l1[0]) )
print( id(l2[0]) )

Output
3121053638984
3121053638984