code: def writer_arg2default(self, x, path=None):
      if path is None:
          with tempfile.NamedTemporaryFile("wb+") as fh:
              self.write(fh)
      else:
          self.write(path)
  
imports: import os
  import pathlib
  import random
  import tempfile
  import pytest
  import networkx
  from networkx.utils.decorators import argmap, not_implemented_for, np_random_state, open_file, py_random_state
  from networkx.utils.misc import PythonRandomInterface
label_desc: Use image node_id 7 for calling the TestOpenFileDecorator obj's underlying member method code with example usage: obj.writer_arg2default(x, path) without return types