ghpythonlib.treehelpers: Using lists instead of trees

This is a really small module that contains two things we’ll use:

tree_to_list

If you have Tree Access set on your input variable, you can use tree_to_list to convert it to a nested list.

With an input parameter x set to Tree Access

import ghpythonlib.treehelpers as th

x = th.tree_to_list(x)

Note that by default, this actually converts the tree rooted at {0} to a nested list, meaning a path {0;A;B} will be equivalent to x[A][B]. If your tree has multiple roots, pass None as the second parameter:

import ghpythonlib.treehelpers as th

x = th.tree_to_list(x, None)
# {0;A;B} now at x[0][A][B]
# {1;C;D} now at x[1][C][D]
# etc.

list_to_tree

Converts a nested list into a data tree, rooted at {0}.

With an output parameter out_tree

import ghpythonlib.treehelpers as th

out_tree = th.tree_to_list([
    [0, 1],
    [2, 3],
    [4, 5, 6]
])

The above example creates a data tree that, when displayed in a panel, will look like:

{0;0}

0
1

{0;1}

2
3

{0;2}

4
5
6