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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 new(self, platform_id):
        # type: (int) -> None
        '''
        A method to create a new El Torito Validation Entry.

        Parameters:
         platform_id - The platform ID to set for this validation entry.
        Returns:
         Nothing.
        '''
        if self._initialized:
            raise pycdlibexception.PyCdlibInternalError('El Torito Validation Entry already initialized')

        self.platform_id = platform_id
        self.id_string = b'\x00' * 24  # FIXME: let the user set this
        self.checksum = 0
        self.checksum = utils.swab_16bit(self._checksum(self._record()) - 1)
        self._initialized = True