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/NumPy 1.17

numpy.ndarray.itemsize

attribute

ndarray.itemsize

Length of one array element in bytes.

Examples

>>> x = np.array([1,2,3], dtype=np.float64)
>>> x.itemsize
8
>>> x = np.array([1,2,3], dtype=np.complex128)
>>> x.itemsize
16

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https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.ndarray.itemsize.html