class_docstr: an immutable object holding a source code fragment,
  possibly deindenting it.
class_docstr_tok: ["an","immutable","object","holding","a","source","code","fragment",",","possibly","deindenting","it","."]
code: def __len__(self):
      return len(self.lines)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import ast
  import inspect
  import linecache
  import sys
  import textwrap
  import tokenize
  import warnings
  from ast import PyCF_ONLY_AST
  from bisect import bisect_right
  import py
  import six
label_desc: Use image node_id 4 for calling the Source obj's underlying member method code with example usage: obj.__len__() and returns: len