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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _is_big_endian(self):
 """ Whether the current endian is big endian. """

        if self.endian == DataTypeMixIn.ENDIAN_NATIVE:
            return SYSTEM_ENDIAN == DataTypeMixIn.ENDIAN_BIG

        return self.endian in (DataTypeMixIn.ENDIAN_BIG, DataTypeMixIn.ENDIAN_NETWORK)