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The append () method adds a single item to the end of a list, while the extend () method adds multiple items to the end of a list. Knowing how to append a list in Python is a fundamental skill for any ...

You could do this forever and would always get the same result. So this is a lot like one of these fractal images. In your example, it's [1,2,[...]] and not [1,2,1,2] because you append a reference to ...