docstr: Extract code from docstring.
docstr_tok: ["Extract","code","from","docstring","."]
code: def _parse_docstring(node):
      """Extract code from docstring."""
      docstring = ast.get_docstring(node)
      if docstring:
          parser = doctest.DocTestParser()
          try:
              dt = parser.get_doctest(docstring, {}, None, None, None)
          except ValueError:
              # >>> 'abc'
              pass
          else:
              examples = dt.examples
              return "\n".join([example.source for example in examples])
      return None
  
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 10 for calling the ImportChecker obj's underlying member method code with example usage: obj._parse_docstring(node) and returns: None, str