[EMAIL PROTECTED] schrieb:
> i'm having trouble trying to figure this out... it's part of a build
> system i'm writing in python. maybe someone has a good simple way to
> solve this. i'm trying to create a dependency order out of multiple
> lists.
>
> list1: B C
> list2: A B
> list3: A C
>
> i want the end result to be the list: A B C
> i'm very frustrated that i can't come up with anything that always
> works.
>
>
> thanks... any clues to solve this would be greatly appreciated.
Maybe the frustration is based on the IMHO wrong data-structure you use.
What does [B, C] mean?
A common approach for this is to create a dict instead, that maps an
object to the list of things it depends on (or that depend on it, it's
essentially the same)
The resulting data-structure is called a directed graph, and there are
algorithms like "partial orderings" you can google for that will help you.
An example graph would be:
dict(
"A" : ["B", "C"],
"B" : ["C"]
"C" : []
)
Then the result of a partial ordering would be
["C", "B", "A"]
which should be what you are after.
Diez
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