code: def parse(x: Union[str, list]) -> Op:
      if isinstance(x, list):
          return Stack(list(map(parse, x)))
      else:
          ts = TokenStream.from_str(x)
          return Parser(ts).parse_expr()
  
imports: import re
  from dataclasses import dataclass, InitVar, field
  from itertools import chain
  from typing import Any, Dict, List, Union, Optional, ClassVar
  import numpy
  from toolz import valfilter, valmap
label_desc: Use image node_id 3 for calling a global function with example usage: parse(x) and returns: Stack, Parser