Dynamo Python script to retrieve all elements from a linked model by category

Dynamo_LinkedElementsByCategory.py

# Enable Python support and load DesignScript library
import clr
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *

# Import ToDSType(bool) extension method
clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.Elements)

# Import DocumentManager and TransactionManager
clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager

# Import RevitAPI
clr.AddReference("RevitAPI")
import Autodesk
from Autodesk.Revit.DB import *

# Importing .NET List colelction, required for ElementMulticategoryFilter
from System.Collections.Generic import List

doc = DocumentManager.Instance.CurrentDBDocument

# The inputs to this node will be stored as a list in the IN variables.
inLink = IN[0]
inCats = IN[1]

# Creating ElementIds from Id integers
catIds = [ElementId(category.Id) for category in inCats]
# Creating a .NET List collection of ElementIds
categoryIds = List[ElementId](catIds)

# Retrieving linked document
mLink = doc.GetElement(ElementId(inLink.Id)).GetLinkDocument()
sysFilter = ElementMulticategoryFilter(categoryIds)

mOut = FilteredElementCollector(mLink) \
	.WhereElementIsNotElementType() \
	.WherePasses(sysFilter) \
	.ToElements()

# Assign your output to the OUT variable.
OUT = mOut

Hi, l am new in Dynamo. I would like to ask you how and where do you write this script in Dynamo ?

You can run it using a Python Script node

Could you please clarify what the input are? I'm feeding category id and link id and its not working.
Thanks.

From memory and looking at the code, inputs are category and link elements, using ootb dynamo nodes tio get them

Thank you

Link instance & category did it. Thanks man!

help guys.. i am a noob.. and trying to get this to work, i feed the link like this:

then i feed it into this Python Script node as IN[0] along with a Category in IN[1]

and i get this error.... which i really can't grasp..

the link is properly selected, i checked it's ID to make sure i didn't accidentally clicked something else...

help!!!

line 32 is a commented line, starting with #, right?...

When trying to make this code work I get an error message:

Warning: IronPythonEvaluator.EvaluateIronPythonScript operation failed.
Traceback (most recent call last):
File "", line 41, in
TypeError: iteration over non-sequence of type NoneType

Las categorias deben darse como lista