code: def parse_requirement(source: str) -> ParsedRequirement:
      return _parse_requirement(Tokenizer(source, rules=DEFAULT_RULES))
  
imports: import ast
  from typing import Any, List, NamedTuple, Optional, Tuple, Union
  from ._tokenizer import DEFAULT_RULES, Tokenizer
label_desc: Use image node_id 1 for calling a global function with example usage: parse_requirement(source) and returns: _parse_requirement