List Process, list map in python


could you help me with some coding?.
I’m trying to code the same logic as in red circle in python.
Basically I don’t know how to processList intersection def.
Need output like from “” after does.intersect node. Hope it does make sense to you :smiley:

Python warning:
Warning: IronPythonEvaluator.EvaluateIronPythonScript operation failed.
Traceback (most recent call last):
File “”, line 10, in
File “”, line 5, in ProcessList
File “”, line 5, in <lambda$170>
File “”, line 8, in Intersection
TypeError: Solid is not iterable


Linking level depth in a custom node with python


The ProcessList() method takes care of zipping the two arguments from lists. You don’t have to perform that inside your Intersection() method. Basically change it to:

def Intersection(elA, elB):
    return elA.DoesIntersect(elB) 

Then call it like so:

OUT = ProcessList(Intersection, ducts, walls)

Make sure that the two lists ducts and walls are exactly of the same structure. It works like this:

ducts = [duct1, duct2, duct3]
walls = [wall1, wall2, wall3]

Calling ProcessList(Intersection, ducts, walls) would result in a list [bool, bool, bool] where bool is a true/false if duct1 intersected wall1, duct2 intersected wall2 and duct3 intersected wall3.

It WILL NOT run duct1 against ALL walls, just pair them up. That’s how Zip() works.

1 Like

Python Nodes Basics

That makes sense. Thank you!



As already explained by Konrad your ProcessList and zip() are comparable to how List.Combine works in Dynamo.

If you need you can use a nested for loop:

import clr
from Autodesk.DesignScript.Geometry import *

solids1 = IN[0]
solids2 = IN[1]
OUT = []

for s1 in solids1:
	sublist = []
	for s2 in solids2:
	OUT.append(sublist), cross-product lacing and this python script will return the same:

If you like map(), this will do the same:

import clr
from Autodesk.DesignScript.Geometry import *

OUT = map(lambda s1: map(lambda s2: s1.DoesIntersect(s2), IN[0]), IN[1])


That’s perfect. Thank you guys!