[Tutor] Help!

Steven D'Aprano steve at pearwood.info
Fri Mar 4 01:32:48 CET 2011

James Reynolds wrote:
> You are almost assuredly going to get flamed for not having a descriptive
> title and for asking what is obviously homework questions

At least Andrew did the right thing by being honest that it was a 
homework question, and by showing the work he's done so far.

But yes, you're right, a more descriptive title is always appreciated.

And speaking for flaming, thank you for not top-posting in the future. 
If you *must* top-post, because you're using one of those stupid "smart" 
phones that won't let you do otherwise, at least apologize for doing so.

Andrew, you ask:

>> but how would i add the 5 min and 13 seconds after 143 items have
>> been produced???

You should always do all your calculations in a single unit of time 
(probably seconds), and only convert back to D HH:MM:SS at the very end.

If you have N items to produce, you need to consider it broken up into
groups of 143 items, plus cooling off time *between* each group. If N is 
an exact multiple of 143 items, you have something like this:


Notice that you don't care about the cooling off time after you're done.

If N is not an exact multiple, there will be some remainder:


You can work out the number of groups of 143, and the remainder left 
over, using the divmod function. Then you can work out the number of 
cooling periods -- this is just the fence post problem. If you have a 
fence with N posts |===|===|===|===|===|===|===|===|===| how many 
sections are there? Or conversely, given M sections of a fence, how many 
posts do you need?


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