code: def __len__(self):
      return self.n_folds
  
file_path: h2o-3/h2o-py/h2o/cross_validation.py
imports: from h2o.utils.compatibility import *
label_desc: Use image node_id 2 for calling the H2OStratifiedKFold obj's underlying member method code with example usage: obj.__len__() and returns: self