class_docstr: Result summary
  
  Construction does not take any parameters. Tables and text can be added
  with the `add_` methods.
  
  Attributes
  ----------
  tables : list of tables
      Contains the list of SimpleTable instances, horizontally concatenated
      tables are not saved separately.
  extra_txt : str
      extra lines that are added to the text output, used for warnings
      and explanations.
docstr: Display as HTML in IPython notebook.
docstr_tok: ["Display","as","HTML","in","IPython","notebook","."]
code: def _repr_html_(self):
      """Display as HTML in IPython notebook."""
      return self.as_html()
  
imports: from statsmodels.compat.python import lmap, lrange, lzip
  import copy
  from itertools import zip_longest
  import time
  import numpy
  from statsmodels.iolib.table import SimpleTable
  from statsmodels.iolib.tableformatting import fmt_2, fmt_2cols, fmt_params, gen_fmt
  from .summary2 import _model_types
label_desc: Use image node_id 4 for calling the Summary obj's underlying member method code with example usage: obj._repr_html_() and returns: self