code: def ensure_table_strings(table):
      
      for row in range(len(table)):
          for column in range(len(table[row])):
              table[row][column] = str(table[row][column])
      return table
docs: Force each cell in the table to be a string
  
      Parameters
      ----------
      table : list of lists
  
      Returns
      -------
      table : list of lists of str