def parse(self):
        """Parses configuration file items from one
        or more related sections.

        """
        for section_name, section_options in self.sections.items():
            method_postfix = ''
            if section_name:  # [section.option] variant
                method_postfix = '_%s' % section_name

            section_parser_method: Optional[Callable] = getattr(
                self,
                # Dots in section names are translated into dunderscores.
                ('parse_section%s' % method_postfix).replace('.', '__'),
                None,
            )

            if section_parser_method is None:
                raise OptionError(
                    "Unsupported distribution option section: "
                    f"[{self.section_prefix}.{section_name}]"
                )

            section_parser_method(section_options)
Parses configuration file items from one
        or more related sections.

        
product/gradle-plugin/src/main/python/setuptools/config/setupcfg.py