def __init__(self, a, b):

        self.a = a
        self.b = b

        # For internal use in report output
        self._fileobj = None
        self._indent = 0

        self._diff()
Returns the size of row items that would be written to the raw FITS
dataset/ETHPy150Open spacetelescope/PyFITS/pyfits/diff.py/_BaseDiff.__init__--crossover with--dataset/ETHPy150Open spacetelescope/PyFITS/pyfits/fitsrec.py/FITS_rec._raw_itemsize