code: def __getitem__(self, key: str) -> str | None:
      return self.get(key)
  
imports: from __future__ import annotations
  import re
  from typing import Callable, Dict, Iterable, Iterator, Pattern
  from typing import Match
  from .regex_parser import AnyNode, Lookahead, Node, NodeSequence, Regex, Repeat, Variable, parse_regex, tokenize_regex
label_desc: Use image node_id 5 for calling the Variables obj's underlying member method code with example usage: obj.__getitem__(key) and returns: self