Make copy of this GeneticCode object with optional replacement
        values for all fields.

def copy(
            self,
            name,
            start_codons=None,
            stop_codons=None,
            codon_table=None,
            codon_table_changes=None):
        """
        Make copy of this GeneticCode object with optional replacement
        values for all fields.
        """
        new_start_codons = (
            self.start_codons.copy()
            if start_codons is None
            else start_codons)

        new_stop_codons = (
            self.stop_codons.copy()
            if stop_codons is None
            else stop_codons)

        new_codon_table = (
            self.codon_table.copy()
            if codon_table is None
            else codon_table)

        if codon_table_changes is not None:
            new_codon_table.update(codon_table_changes)

        return GeneticCode(
            name=name,
            start_codons=new_start_codons,
            stop_codons=new_stop_codons,
            codon_table=new_codon_table)