Re-inserting nested data

[Daley, MarkX]

I have lists that consist of 17 data values for each list item.  I have no
problem extracting the data to convert it using the following:

	for item in times:
		time2 = item[-1]

However, I'm at a loss as to how I can re-insert the converted data to the
location I pulled it from, essentially re-writing the data that was there.
Any ideas?

Regards,

Mark Daley