~$ python3
Python 3.10.5 (main, Jun  8 2022, 09:26:22) [GCC 11.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> CACHE_SZ = 64
>>> [[0]*16]*(CACHE_SZ/16)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can't multiply sequence by non-int of type 'float'
>>> [[0]*16]*(CACHE_SZ//16)
[[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]]
>>>