class_docstr: Holder class with indexing
  
      
code: def __iter__(self):
      yield from self.tuple
  
file_path: statsmodels/statsmodels/stats/base.py
imports: from statsmodels.compat.python import lzip
  import numpy
  from statsmodels.tools.testing import Holder
label_desc: Use image node_id 2 for calling the HolderTuple obj's underlying member method code with example usage: obj.__iter__() without return types