code: def GoldenFile(filename):
      """Finds the given golden file and returns a file object representing it."""
  
      # Search up the directory tree looking for the C++ protobuf source code.
      path = "."
      while os.path.exists(path):
          if os.path.exists(os.path.join(path, "src/google/protobuf")):
              # Found it.  Load the golden file from the testdata directory.
              full_path = os.path.join(
                  path, "src/google/protobuf/testdata", filename
              )
              return open(full_path, "rb")
          path = os.path.join(path, "..")
  
      # Search internally.
      path = "."
      full_path = os.path.join(
          path, "third_party/py/google/protobuf/testdata", filename
      )
      if os.path.exists(full_path):
          # Found it.  Load the golden file from the testdata directory.
          return open(full_path, "rb")
  
      raise RuntimeError(
          "Could not find golden files.  This test must be run from within the "
          "protobuf source package so that it can read test data files from the "
          "C++ source tree."
      )
  
imports: import numbers
  import operator
  import os.path
  import sys
  from google.protobuf import unittest_import_pb2
  from google.protobuf import unittest_pb2
  from google.protobuf import descriptor_pb2
label_desc: Use image node_id 8 for calling a global function with example usage: GoldenFile(filename) and returns: open, open