code: def find_ref(self, name: str) -> t.Optional[str]:
      if name in self.refs:
          return self.refs[name]
  
      if self.parent is not None:
          return self.parent.find_ref(name)
  
      return None
  
imports: import typing
  from .None import nodes
  from .visitor import NodeVisitor
label_desc: Use image node_id 5 for calling the Symbols obj's underlying member method code with example usage: obj.find_ref(name) and returns: None, self, self