Accessing one list out of a list of lists

Hi Everyone

As you can see from the picture below I have a lists of lists which I believe in Grasshopper is called a datatree. I am passing this lists of lists into a python component and in that python component I want to be able to access just one list out of these lists of lists.

I am a bit confused about what code I should write in the python component to achieve this can anyone please point me in the right direction? Thankyou!

he right direction?

Replies to This Discussion

Permalink Reply by Giulio Piacentino on January 6, 2015 at 2:31am

Hi Anton

if you mean that the component should disregard the whole rest of those inputs, then set the desired parameter (right-click) from 'Item Access' to 'Tree Access' and use this code:

a = x.Branch(5) #5 is the index of the branch you want

You can also specify a path, if you know it.

import Grasshopper as GH a = x.Branch(GH.Kernel.Data.GH_Path(1,2,3))

By the way, panels transform contents to text. Be aware of it if you use those values directly.

If you meant that you needed to access each list, each one singularly, then just use 'List Access'. The component will re-iterate your code the needed amount of times.

You could also inspect in which iteration you are with this code, but I would not suggest it:

iteration = ghenv.DataAccessManager.Iteration

I hope this helps,

Giulio
--
Giulio Piacentino
for Robert McNeel & Associates
giulio@mcneel.com

Permalink Reply by Anton Szilasi on January 7, 2015 at 9:56pm

Thank you Giulio!

Permalink Reply by Anton Szilasi on January 8, 2015 at 12:07am

Hi Giulio

I am a bit confused can I asked what is the language of this code? Where can I find more information on how to use this language? For example I would like to create my own component that entwines data.

Thank you!

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