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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 parse(self, extent, desc_tag):
        # type: (int, UDFTag) -> None
        '''
        Parse the passed in data into a UDF Terminating Descriptor.

        Parameters:
         extent - The extent that this descriptor currently lives at.
         desc_tag - A UDFTag object that represents the Descriptor Tag.
        Returns:
         Nothing.
        '''
        if self._initialized:
            raise pycdlibexception.PyCdlibInternalError('UDF Terminating Descriptor already initialized')

        self.desc_tag = desc_tag

        self.orig_extent_loc = extent

        self._initialized = True