Hello,
I’ve used a node from Rythm to sort out doors and rooms that have a connection. I now want to add a number behind this information so that you can see how many doors that belongs to a certain room. I’m stuck on how to solve the last bit, how to append the running number. I guess I could write to excel and then read from excel but I’m looking to automate the whole process if possible?
Thank you,
Rickard
One nudge in the right direction: Try a List.GroupByKey instead of a sort by key. Then a List.Count, number range, and join.
List lacing and list levels will matter here. 
Thank you Jacob!
I really had to think and spend som time with this one :). This is my solution. I guess you could have done this without the python node I just couldn’t figure out how. Anyhow, this solution worked. Thank you again for your input Jakob.
Python node below:
**# Load the Python Standard and DesignScript Libraries**
**import sys**
**import clr**
**clr.AddReference('ProtoGeometry')**
**from Autodesk.DesignScript.Geometry import ***
**# The inputs to this node will be stored as a list in the IN variables.**
**dataEnteringNode = IN**
**# Place your code below this line**
**lst_rooms=IN[0]**
**lst_doors=IN[1]**
**list_names=[]**
**for i in range(len(lst_rooms)):**
** list_names.append(str(lst_rooms[i])+"."+str(lst_doors[i]))**
**# Assign your output to the OUT variable.**
**OUT = list_names**
