code: def _make_df_square(table):
      """
      Reindex a pandas DataFrame so that it becomes square, meaning that
      the row and column indices contain the same values, in the same
      order.  The row and column index are extended to achieve this.
      """
  
      if not isinstance(table, pd.DataFrame):
          return table
  
      # If the table is not square, make it square
      if not table.index.equals(table.columns):
          ix = list(set(table.index) | set(table.columns))
          ix.sort()
          table = table.reindex(index=ix, columns=ix, fill_value=0)
  
      # Ensures that the rows and columns are in the same order.
      table = table.reindex(table.columns)
  
      return table
  
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 1 for calling a global function with example usage: _make_df_square(table) and returns: table, table