[Tutor] suggestions for splitting file based on date

[Sivaram Neelakantan]

On Sat, Jul 20 2013,Peter Otten wrote:

> Sivaram Neelakantan wrote:

[snipped 16 lines]

> I'd start with a single list for the complete data, reverse that using the 
> aptly named method and then create the three smaller lists using slicing. 
>
> For example:
>
>>>> stock_data = range(10)
>>>> stock_data.reverse()
>>>> stock_data
> [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
>>>> stock_data[:3] # the last three days
> [9, 8, 7]
>
> On second thought I don't see why you want to reverse the data. If you omit 
> that step you need to modify the slicing:
>
>>>> stock_data = range(10)
>>>> stock_data[-3:] # the last three days
> [7, 8, 9]
>

Thank you, this is as simple as it gets.  The only wiggle is the
trading day versus the calendar day.  If I use the trading day, the
above slicing will work(a simple numerical count, to represent 30
*trading* day window) but the calendar day is a lot more hops
accounting for weekends or days of no trading.  I believe I'd have to
end up doing a date compare.


[snipped 7 lines]


 sivaram
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