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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 map_seqprop_resnums_to_structprop_resnums(self, resnums, seqprop=None, structprop=None, chain_id=None, use_representatives=False):
 """Map a residue number in any SeqProp to the structure's residue number for a specified chain. Args: resnums (int, list):
 Residue numbers in the sequence seqprop (SeqProp):
 SeqProp object structprop (StructProp):
 StructProp object chain_id (str):
 Chain ID to map to use_representatives (bool):
 If the representative sequence and structure should be used. If True, seqprop, structprop, and chain_id do not need to be defined. Returns: dict: Mapping of sequence residue numbers to structure residue numbers """

        resnums = ssbio.utils.force_list(resnums)

        if use_representatives:
            seqprop = self.representative_sequence
            structprop = self.representative_structure
            chain_id = self.representative_chain
            if not structprop:
                raise ValueError('No representative structure set, please specify sequence, structure, and chain ID')
        else:
            if not seqprop or not structprop or not chain_id:
                raise ValueError('Please specify sequence, structure, and chain ID')

        mapping_to_repchain_index = self._map_seqprop_resnums_to_structprop_chain_index(resnums=resnums,
                                                                                        seqprop=seqprop,
                                                                                        structprop=structprop,
                                                                                        chain_id=chain_id,
                                                                                        use_representatives=use_representatives)

        chain = structprop.chains.get_by_id(chain_id)
        chain_structure_resnum_mapping = chain.seq_record.letter_annotations['structure_resnums']

        final_mapping = {}
        for k, v in mapping_to_repchain_index.items():
            k = int(k)
            rn = chain_structure_resnum_mapping[v]

            if rn == float('Inf'):
                log.warning('{}-{}, {}: structure file does not contain coordinates for this residue'.format(structprop.id,
                                                                                                             chain_id,
                                                                                                             k))
            else:
                rn = int(rn)
                final_mapping[k] = rn
                index_of_structure_resnum = chain_structure_resnum_mapping.index(rn)

                # Additionally report if residues are the same - they could be different in the structure though
                format_data = {'seqprop_id'       : seqprop.id,
                               'seqprop_resid'    : seqprop[k - 1],
                               'seqprop_resnum'   : k,
                               'structprop_id'    : structprop.id,
                               'structprop_chid'  : chain_id,
                               'structprop_resid' : chain.seq_record[index_of_structure_resnum],
                               'structprop_resnum': rn}

                if seqprop[k-1] != chain.seq_record[index_of_structure_resnum]:
                    log.warning('Sequence {seqprop_id} residue {seqprop_resid}{seqprop_resnum} does not match to '
                                'structure {structprop_id}-{structprop_chid} residue '
                                '{structprop_resid}{structprop_resnum}. NOTE: this may be due to '
                                'structural differences'.format(**format_data))
                else:
                    log.debug('Sequence {seqprop_id} residue {seqprop_resid}{seqprop_resnum} is mapped to '
                              'structure {structprop_id}-{structprop_chid} residue '
                              '{structprop_resid}{structprop_resnum}'.format(**format_data))

        return final_mapping