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()
The ``_BaseDiff`` class does not implement a ``_diff`` method and
dataset/ETHPy150Open spacetelescope/PyFITS/pyfits/diff.py/_BaseDiff.__init__