enumeration code help

[nilamo]

Sure can! So we have a base of understanding, here's your current code:

>>> tmp = [
... [1, 2, 3, 4],
... [5, 6, 7, 8],
... [9, 10, 11, 12]
... ]
>>> newList = []
>>> for rec in tmp:
...   newList.append([rec[0]*2, rec[1]*2, rec[3]*2])
...
>>> newList
[[2, 4, 8], [10, 12, 16], [18, 20, 24]]

Here's a list comprehension that does the same:

>>> [[a*2, b*2, d*2] for a,b,c,d in tmp]
[[2, 4, 8], [10, 12, 16], [18, 20, 24]]