code: def mode(data):
      
      # Generate a table of sorted (value, frequency) pairs.
      table = counts(data)
      if len(table) == 1:
          return table[0][0]
      elif table:
          raise StatisticsError(
              'no unique mode; found %d equally common values' % len(table)
          )
      else:
          raise StatisticsError('no mode for empty data')
docs: Return the most common data point from discrete or nominal data.
  
      ``mode`` assumes discrete data, and returns a single value. This is the
      standard treatment of the mode as commonly taught in schools:
  
      If there is not exactly one most common value, ``mode`` will raise
      StatisticsError.