How to create an icollection to work with revit api

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2

You have done it in line 38.
Try to replace ids with col1 in line 44

Edit: To answer the title of the thread:
A C# ICollection(ElementId) equivalent in python : List[ElementId]

Remember the following reference
clr.AddReference(“System”)
from System.Collections.Generic import List

Example:
col1 = List[ElementId](ids)

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