```
import copy               # this is the module to use
l1 = [[10,20,30], 1, 2, 3]
l2 = copy.deepcopy(l1)             # create a copy using the deepcopy function from copy

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

print( l1 )
print( l2 )
```

**Output**
*[[10, 20, 30, 40], 1, 2, 3, 4]*
*[[10, 20, 30], 1, 2, 3]*