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numpy.char.chararray.itemsize
attribute
- chararray.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://numpy.org/doc/1.19/reference/generated/numpy.char.chararray.itemsize.html