code: def visit_arg(self, node: ast.arg) -> str:
      if node.annotation:
          return f"{node.arg}: {self.visit(node.annotation)}"
      else:
          return node.arg
  
imports: from __future__ import annotations
  import ast
  from typing import NoReturn, overload
label_desc: Use image node_id 3 for calling the _UnparseVisitor obj's underlying member method code with example usage: obj.visit_arg(node) and returns: node, str, self, node