class_docstr: Execute the file and store the output, docstring, and
  sequence of matplotlib figures
code: def __init__(self, filename, execute=True, print_output=False):
      self.filename = filename
      self.extract_docstring()
      self.figlist = []
      self.output = ""
      self.stdout = sys.stdout
      self.print_output = print_output
      if execute:
          self.execute_file()
  
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 1 to create a new ExecFile object  with example: obj = ExecFile(filename, execute, print_output)