How to use the pysubs2.ssastyle.SSAStyle function in pysubs2

elif inside_info_section or inside_aegisub_section:
                if line.startswith(";"): continue # skip comments
                try:
                    k, v = line.split(": ", 1)
                    if inside_info_section:
                        subs.info[k] = v
                    elif inside_aegisub_section:
                        subs.aegisub_project[k] = v
                except ValueError:
                    pass
            elif line.startswith("Style:"):
                _, rest = line.split(": ", 1)
                buf = rest.strip().split(",")
                name, raw_fields = buf[0], buf[1:] # splat workaround for Python 2.7
                field_dict = {f: string_to_field(f, v) for f, v in zip(STYLE_FIELDS[format_], raw_fields)}
                sty = SSAStyle(**field_dict)
                subs.styles[name] = sty
            elif line.startswith("Dialogue:") or line.startswith("Comment:"):
                ev_type, rest = line.split(": ", 1)
                raw_fields = rest.strip().split(",", len(EVENT_FIELDS[format_])-1)
                field_dict = {f: string_to_field(f, v) for f, v in zip(EVENT_FIELDS[format_], raw_fields)}
                field_dict["type"] = ev_type
                ev = SSAEvent(**field_dict)
                subs.events.append(ev)

def copy(self):
        return SSAStyle(**self.as_dict())