code: def __str__(self):
      return self.summary_frame().to_string()
  
imports: import numpy
  from scipy.stats import f
  from scipy.stats import t
  from scipy import stats
  from statsmodels.tools.tools import clean0, fullrank
  from statsmodels.stats.multitest import multipletests
label_desc: Use image node_id 4 for calling the WaldTestResults obj's underlying member method code with example usage: obj.__str__() and returns: self