code: def lineof(self, section: str, name: str | None = None) -> int | None:
      lineno = self._sources.get((section, name))
      return None if lineno is None else lineno + 1
  
imports: from __future__ import annotations
  from typing import Callable, Iterator, Mapping, Optional, Tuple, TypeVar, Union, TYPE_CHECKING, NoReturn, NamedTuple, overload, cast
  import os
  from .exceptions import ParseError
  from .None import _parse
  from ._parse import COMMENTCHARS, iscommentline
label_desc: Use image node_id 2 for calling the IniConfig obj's underlying member method code with example usage: obj.lineof(section, name) and returns: unknown