Il giorno sab, 12/11/2011 alle 15.05 +0800, Andrew Rowland ha scritto:
> I have a group of information that is related in a hierarchical
> structure. I display the structure in a treeview. I am trying to
> roll up various calculations where, the sum of the lower levels
> becomes the unit value of the next higher level. Below is, hopefully,
> a helpful example of how the calculations should roll up.
>
> Description Quantity Unit Cost Total Cost
> System 1 21.42
> 21.42
> Subsystem 1 1 12.45
> 12.45
> Assembly 1 2 4.85
> 9.70
> Part 1 1 0.10
> 0.10
> Part 2 2 1.00
> 2.00
> Part 3 5 0.55
> 2.75
> Assembly 2 1 1.70
> 1.70
> Part 4 2 0.55
> 1.10
> Part 5 3 0.20
> 0.60
> Subsystem 2 1 8.97
> 8.97
> Assembly 3 1 8.97
> 8.97
> Subassembly 1 1 8.97
> 8.97
> Part 6 1 2.98
> 2.98
> Part 7 1 5.99
> 5.99
>
> Clearly, things need to be calculated in the correct order starting
> with Part and working up to System. I am struggling with a good way
> to "walk" up the tree making all the calculations at one level before
> continuing to the next higher level. I'm sure it's not as difficult
> as I've convinced myself it is.
I'd proceed recursively (untested/pseudo code):
def value (iter):
if tree.iter_has_child():
val = 0
for index in range( tree.iter_n_children( iter ) ):
val += value( tree.iter_nth_child( iter, i ) )
return val
else:
return tree.get( iter, 3 )
bye
Pietro
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