numpy.dtype.isalignedstruct
attribute
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dtype.isalignedstruct
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Boolean indicating whether the dtype is a struct which maintains field alignment. This flag is sticky, so when combining multiple structs together, it is preserved and produces new dtypes which are also aligned. 
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Licensed under the 3-clause BSD License.
    https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.dtype.isalignedstruct.html