numpy.matrix.itemsize
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matrix.itemsize
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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-1.11.0/reference/generated/numpy.matrix.itemsize.html