docstr: Check docstring of class, if docstring is used for doctest.
docstr_tok: ["Check","docstring","of","class",",","if","docstring","is","used","for","doctest","."]
code: def visit_ClassDef(self, node):
      """
      Check docstring of class, if docstring is used for doctest.
      """
      docstring = self._parse_docstring(node)
      if docstring:
          self._str_codes.append(
              (docstring, node.lineno + self._lineno + 2)
          )
  
imports: from __future__ import print_function, division, absolute_import
  import json
  import os
  import sys
  import six
  import fnmatch
  import importlib
  import ast
  import doctest
  import collections
  import functools
  from pathlib2 import Path
  from .utils import parse_git_config
  from .modules import ImportedModules
label_desc: Use image node_id 8 for calling the ImportChecker obj's underlying member method code with example usage: obj.visit_ClassDef(node) without return types