old_contents: import re
  from random import randint
  
  
  class Die():
      """Represents a die. Defaults to d6."""
  
      def _roll_command_slicer(roll_command):
          """Processes a roll_command like '3d6' or '1d4+1'.
          
          It expects either two or three matches:
          1: the number of times the die should be rolled
          2: the number of sides on the dice
          3. the +/- modifier, which is optional
  
          Returns a tuple.
          """
          pattern = re.compile('(\d{1,4})d(\d{1,4})(\+\d{1,5})?')
          matches = re.match(pattern, roll_command).groups()
          matches_length = len(matches)
  
          if matches_length < 4 and matches_length > 1:
              return matches
  
  
      def _roller(roll_command_tuple):
          """Takes in a tuple, like ('2', '6', 'None') and rolls the dice.
          
          ('2', '6', 'None') means '2d6' without a +/- roll modifier.
          """
          pass
  
  
      def __init__(self, roll_command):
  
          self.num_sides = num_sides
  
  
      def __repr__(self):
          return 'A {num}-sided die.'.format(num=self.num_sides)
  
  
      def roll(self, num_rolls=1, show_rolls=False):
          """Rolls a die a specified number of times. Defaults to one roll.
          Returns the sum of the rolls (integer), unless `show_rolls=True` in
          which case it returns a two-item list. The first item is the (integer)
          sum of the rolls. The second item is a list of the rolls.
          """
          rolls = [randint(1, self.num_sides) for roll in range(num_rolls)]
          total = sum(rolls)
          if show_rolls is True:
              return [total, rolls]
          return total
  
  
new_contents: import re
  from random import randint
  
  
  class Die():
      """Represents a die."""
  
      def _roll_command_slicer(roll_command):
          """Processes a roll_command like '3d6' or '1d4+1'.
          
          It expects either two or three matches:
          1: the number of times the die should be rolled
          2: the number of sides on the dice
          3. the +/- modifier, which is optional
  
          Returns a tuple.
          """
          pattern = re.compile('(\d{1,4})d(\d{1,4})(\+\d{1,5})?')
          matches = re.match(pattern, roll_command).groups()
          matches_length = len(matches)
  
          if matches_length < 4 and matches_length > 1:
              return matches
  
  
      def _roller(roll_command_tuple):
          """Takes in a tuple, like ('2', '6', 'None') and rolls the dice.
          
          ('2', '6', 'None') means '2d6' without a +/- roll modifier.
          """
          pass
  
  
      def __init__(self, roll_command):
          # TODO: write this.
          self.num_sides = num_sides
  
  
      def __repr__(self):
          # TODO: rewrite this.
          return 'A {num}-sided die.'.format(num=self.num_sides)
  
  
      def roll(self, num_rolls=1, show_rolls=False):
          """Rolls a die a specified number of times. Defaults to one roll.
          Returns the sum of the rolls (integer), unless `show_rolls=True` in
          which case it returns a two-item list. The first item is the (integer)
          sum of the rolls. The second item is a list of the rolls.
          """
          # TODO: rewrite all of this.
          rolls = [randint(1, self.num_sides) for roll in range(num_rolls)]
          total = sum(rolls)
          if show_rolls is True:
              return [total, rolls]
          return total
  
  
subject: Fix comments