A error happened in python, wenn use Class

Grasshopper
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Hey, everyone!
did anyone know, why I can not get the “Panels” in Python, like the Picture

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11266×637 186 KB

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Panels.append(yourItem). This is Python syntax actually…

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Thanks ,Tom!
I know that .append is add a new item to a list.
But I am the first time to use “Class” and the ghpython is now always the puzzle for me.
Anyways Thank you so much