I have this code:

```
l = [1.0, 2.0, 3.0, 4.0, 5.0, 6.0]

def add(l, n):
    lret = l.copy()
    i = n
    while i <= len(lret):
      lret.insert(i, 0.0)
      i += (n+1)
    return lret

lret = add(l,2)

print(lret)

```

Is a way to make the `add()` function a one-line function?