How to use the biolib.seq_io.write_fasta function in biolib

def unbinned(self, options):
        """Unbinned Command"""

        check_dir_exists(options.genome_nt_dir)

        genomes_files = self._genome_files(options.genome_nt_dir, options.genome_ext)
        if not self._check_nuclotide_seqs(genomes_files):
            self.logger.warning('All files must contain nucleotide sequences.')
            sys.exit()

        unbinned = Unbinned()
        unbinned_seqs = unbinned.run(genomes_files, options.scaffold_file, options.min_seq_len)

        seq_io.write_fasta(unbinned_seqs, options.output_file)

        self.logger.info('Unbinned scaffolds written to: ' + options.output_file)

with open(outlier_file) as f:
            f.readline()

            for line in f:
                if line[0] == '#':
                    continue
                    
                line_split = line.split('\t')
                scaffold_id = line_split[0]
                rtn = genome_seqs.pop(scaffold_id, None)
                if rtn:
                    bModified = True

        # save modified bin
        if bModified or not modified_only:
            seq_io.write_fasta(genome_seqs, out_genome)

if bin_id == cur_bin_id:
                    scaffold_ids.add(scaffold_id)

        # add compatible sequences to genome
        added_seqs = 0
        genome_seqs = seq_io.read(genome_file)
        for seq_id, seq in seq_io.read_seq(scaffold_file):
            if seq_id in scaffold_ids:
                if len(seq) >= min_len:
                    genome_seqs[seq_id] = seq
                    added_seqs += 1
                
        self.logger.info('Added {:,} scaffolds meeting length criterion.'.format(added_seqs))

        # save modified bin
        seq_io.write_fasta(genome_seqs, out_genome)

self.logger.info('Identified {:,} compatible scaffolds.'.format(len(compatible_scaffolds)))

        # add compatible sequences to genome
        added_seqs = 0
        genome_seqs = seq_io.read(genome_file)
        for seq_id, seq in seq_io.read_seq(scaffold_file):
            if seq_id in compatible_scaffolds:
                if len(seq) >= min_len:
                    genome_seqs[seq_id] = seq
                    added_seqs += 1
                
        self.logger.info('Added {:,} scaffolds meeting length criterion.'.format(added_seqs))

        # save modified bin
        seq_io.write_fasta(genome_seqs, out_genome)

self.logger.info('Identified {:,} compatible scaffolds.'.format(len(compatible_scaffolds)))

        # add compatible sequences to genome
        added_seqs = 0
        genome_seqs = seq_io.read(genome_file)
        for seq_id, seq in seq_io.read_seq(scaffold_file):
            if seq_id in compatible_scaffolds:
                if len(seq) >= min_len:
                    genome_seqs[seq_id] = seq
                    added_seqs += 1
                
        self.logger.info('Added {:,} scaffolds meeting length criterion.'.format(added_seqs))

        # save modified bin
        seq_io.write_fasta(genome_seqs, out_genome)