code: def expect(self, kind: str) -> Token | None:
      # Return next token and advance position if kind matches
      tkn = self.next()
      if tkn is not None:
          if tkn.kind == kind:
              return tkn
          self.backup()
      return None
  
file_path: cpython/Tools/cases_generator/plexer.py
imports: import lexer
label_desc: Use image node_id 9 for calling the PLexer obj's underlying member method code with example usage: obj.expect(kind) and returns: None, tkn