Suppose I have a lists of lists (called someListofLists) and I want to multiply the 4th element of each sublist by 2. I could do the following:

```
new=[]
for k in someListofLists:
    this=k
    this[3]=this[3]*2
    new.append(this)

```

Is there a more elegant way to do this with list comprehensions or other techniques? I would like the output to still be a list of lists.