code: def _argtypes_string(self):
      if not self.args:
          return "void"
      argstr = ", ".join([_repl(a[0]) for a in self.args])
      return argstr
  
imports: import hashlib
  import io
  import os
  import re
  import sys
  import importlib.util
  import textwrap
  from os.path import join
label_desc: Use image node_id 2 for calling the FunctionApi obj's underlying member method code with example usage: obj._argtypes_string() and returns: argstr, str