class_docstr: provide attribute-style access to a nested dict
class_docstr_tok: ["provide","attribute-style","access","to","a","nested","dict"]
code: def __dir__(self):
      return list(self.d.keys())
  
imports: from collections import namedtuple
  from contextlib import contextmanager
  import re
  import warnings
  import pandas.compat
  from pandas.compat import lmap, map, u
label_desc: Use image node_id 4 for calling the DictWrapper obj's underlying member method code with example usage: obj.__dir__() and returns: list