numpy-100
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#4 memory size of any array
The question means the total bytes consumed by the element of the array. In order to clear up the misunderstanding, it is suggested to revise the question stem.
Z.nbytes is more direct then Z.size * Z.itemsize.
BTW, 4 typos: an hint -> a hint of of -> of every combinations -> every combination a two dimensional -> a two-dimensional
References: https://numpy.org/doc/stable/reference/generated/numpy.ndarray.nbytes.html https://docs.python.org/3/library/sys.html#sys.getsizeof
You're right but the question is a pretext to show size itemize. But we could also illustrate using nbytes == size*itemsize. Do you want to make a PR?