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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):
        # type: () -> None
        '''
        A method to create a new UDF Anchor Volume Structure.

        Parameters:
         None.
        Returns:
         Nothing.
        '''
        if self._initialized:
            raise pycdlibexception.PyCdlibInternalError('UDF Anchor Volume Structure already initialized')

        self.desc_tag = UDFTag()
        self.desc_tag.new(2)  # FIXME: we should let the user set serial_number
        self.main_vd_length = 32768
        self.main_vd_extent = 0  # This will get set later.
        self.reserve_vd_length = 32768
        self.reserve_vd_extent = 0  # This will get set later.

        self._initialized = True