class_docstr: Flags that map to parsed keys/namespaces.
class_docstr_tok: ["Flags","that","map","to","parsed","keys\/namespaces","."]
code: def unset_all(self, key: Key) -> None:
      cont = self._flags
      for k in key[:-1]:
          if k not in cont:
              return
          cont = cont[k]["nested"]
      cont.pop(key[-1], None)
  
imports: from __future__ import annotations
  from collections.abc import Iterable
  import string
  from types import MappingProxyType
  from typing import Any, BinaryIO, NamedTuple
  from ._re import RE_DATETIME, RE_LOCALTIME, RE_NUMBER, match_to_datetime, match_to_localtime, match_to_number
  from ._types import Key, ParseFloat, Pos
label_desc: Use image node_id 4 for calling the Flags obj's underlying member method code with example usage: obj.unset_all(key) without return types