Dealing with Curves

Hallo everyone,
I’m trying to start working with Python inside grasshopper.
My try depends on using curves.
The problem is that each curve returning as 4 curves in the Output.
In the Photo I only inserted 1 curve and have already sat it as curve item.
Then assigned it to a. but a is appearing as 4 similar curves.
Can anyone help me please.

Hello,

You seem to have 4 buildings in your Building input.
I assume you haven’t changed the data access, so your Python component will run, as most native GH components, one time for each item provided in inputs, even if this items are not used in the code.

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Correct. I changed the Building input to list and it works right now. Thank you very much for the information!