List of lists of lists - Wikipedia

Python 3.12.7 (main, Oct  1 2024, 00:00:00) [GCC 14.2.1 20240912 (Red Hat 14.2.1-3)] on linux
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>>> l = []
>>> l[:] = [l] * 10
>>> l
[[...], [...], [...], [...], [...], [...], [...], [...], [...], [...]]

I got my hopes up; it isn't as exciting once I continued exploring all of them.