class_docstr: Example Builder for sphinx documentation
code: def rst_index_filename(self, dir_path):
      return os.path.join(self.rst_dir, dir_path, "index.rst")
  
imports: import sys
  import os
  import traceback
  import token
  import tokenize
  import gc
  import shutil
  import glob
  import warnings
  import matplotlib
  from matplotlib import image
  from matplotlib import pyplot
label_desc: Use image node_id 9 for calling the ExampleBuilder obj's underlying member method code with example usage: obj.rst_index_filename(dir_path) and returns: os