class_docstr: Handles metadata supplied in configuration files.
class_docstr_tok: ["Handles","metadata","supplied","in","configuration","files","."]
docstr: Parses configuration file items from one
  or more related sections.
docstr_tok: ["Parses","configuration","file","items","from","one","or","more","related","sections","."]
code: 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)
  
imports: import contextlib
  import functools
  import os
  from collections import defaultdict
  from functools import partial
  from functools import wraps
  from typing import TYPE_CHECKING, Callable, Any, Dict, Generic, Iterable, List, Optional, Set, Tuple, TypeVar, Union
  from ..errors import FileError, OptionError
  from ..extern.packaging.markers import default_environment
  from ..extern.packaging.requirements import InvalidRequirement, Requirement
  from ..extern.packaging.specifiers import SpecifierSet
  from ..extern.packaging.version import InvalidVersion, Version
  from ..warnings import SetuptoolsDeprecationWarning
  from .None import expand
label_desc: Use image node_id 15 for calling the ConfigHandler obj's underlying member method code with example usage: obj.parse() without return types