code: def __str__(self):
      ky = [k for k, _ in self.__dict__.items()]
      ky.sort()
      m = max([len(k) for k in ky])
      tab = []
      f = "{:" + str(m) + "}   {}"
      for k in ky:
          tab.append(f.format(k, self.__dict__[k]))
      return "\n".join(tab)
  
imports: import warnings
  import numpy
  import pandas
  from scipy import stats
  from statsmodels import iolib
  from statsmodels.tools import sm_exceptions
  from statsmodels.tools.decorators import cache_readonly
label_desc: Use image node_id 2 for calling the _Bunch obj's underlying member method code with example usage: obj.__str__() and returns: str