Grasshopper

algorithmic modeling for Rhino

Data tree in python

Hi, I have never used Python before so I have a question how to do rather (I think) simple task.

I want to generate a list with numbers up to n but I want to have n lists where the number of  items in lists is the number of the list. Huh this is hard to understand so I will just sketch an example:

n=4

Tree with 4 branches, each branch is a list with different length:

1.

1.

2.

1.

2.

3.

1.

2.

3.

4.

Maybe there is a way to make this in just grasshopper but I thought it should be python

Views: 776

Replies to This Discussion

Permalink Reply by Mateusz Mazurek on August 14, 2015 at 1:57pm

ok, I have found partially an answer:

listoflists = []
a_list = []
for i in range(0,x):
a_list.append(i)
if len(a_list)>0:

listoflists.append(list(a_list))
print listoflists
a = listoflists

this prints me this:

[[0], [0, 1], [0, 1, 2], [0, 1, 2, 3], [0, 1, 2, 3, 4], [0, 1, 2, 3, 4, 5], [0, 1, 2, 3, 4, 5, 6], [0, 1, 2, 3, 4, 5, 6, 7]]

this is what I wanted but how to convert this to tree in grasshopper?

In grasshopper I just get:

8x IronPython.Runtime.List

Permalink Reply by Shane Simon on August 14, 2015 at 2:31pm

I had a similar problem. This thread summed up the solution:

Understanding how Python interacts with iterations

Permalink Reply by 筑梦NARUTO on August 15, 2015 at 7:41am

hi Mateusz

You can use a grasshopper SDK understand datatree,Check the attached file


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