More precisely, I want to know how can i use Python to output all the walls in WallType node except the interior partitions !
you don’t need Python, you can filter for the Function parameter and take only those that have a value equal to 1.
See reference
https://www.revitapidocs.com/2020/ccafc685-892f-511b-1db6-e7bf1116268d.htm
If you want to use Python:
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Wow this is awesome, thank you sooo much 