old_contents: """ Concise UUID generation. """
  
  import uuid as _uu
  
  # Define our alphabet.
  _ALPHABET = "23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
  
  def encode(uuid):
      """
      Encodes a UUID into a string (LSB first) according to the alphabet
      If leftmost (MSB) bits 0, string might be shorter
      """
      unique_id = uuid.int
      alphabet_length = len(_ALPHABET)
      output = ""
      while unique_id > 0:
          digit = unique_id % alphabet_length
          output += _ALPHABET[digit]
          unique_id = int(unique_id / alphabet_length)
      return output
  
  def decode(string):
      """
      Decodes a string according to the current alphabet into a UUID
      Raises ValueError when encountering illegal characters or too long string
      If string too short, fills leftmost (MSB) bits with 0.
      """
      number = 0
      for char in string[::-1]:
          value = _ALPHABET.index(char)
          number = number * len(_ALPHABET) + value
      return _uu.UUID(int = number)
  
  def uuid(name=None):
      """
      Generate and return a UUID.
  
      If the name parameter is provided, set the namespace to the provided
      name and generate a UUID.
      """
      # If no name is given, generate a random UUID.
      if name is None:
          uuid = _uu.uuid4()
      elif not "http" in name:
          uuid = _uu.uuid5(_uu.NAMESPACE_DNS, name)
      else:
          uuid = _uu.uuid5(_uu.NAMESPACE_URL, name)
      return encode(uuid)
  
  def get_alphabet():
      """Return the current alphabet used for new UUIDs."""
      return _ALPHABET
  
  def set_alphabet(alphabet):
      """Set the alphabet to be used for new UUIDs."""
      global _ALPHABET
  
      try:
         set
      except NameError:
         from sets import Set as set
  
      # Turn the alphabet into a set and sort it to prevent duplicates
      # and ensure reproducibility.
      new_alphabet = "".join(sorted(set(alphabet)))
      if len(new_alphabet) > 1:
          _ALPHABET = new_alphabet
      else:
          raise ValueError("Alphabet with more than one unique symbols required.")
  
new_contents: """ Concise UUID generation. """
  
  import uuid as _uu
  
  # Define our alphabet.
  _ALPHABET = "23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"
  
  def encode(uuid):
      """
      Encodes a UUID into a string (LSB first) according to the alphabet
      If leftmost (MSB) bits 0, string might be shorter
      """
      unique_id = uuid.int
      alphabet_length = len(_ALPHABET)
      output = ""
      while unique_id > 0:
          digit = unique_id % alphabet_length
          output += _ALPHABET[digit]
          unique_id = int(unique_id/alphabet_length)
      return output
  
  def decode(string):
      """
      Decodes a string according to the current alphabet into a UUID
      Raises ValueError when encountering illegal characters or too long string
      If string too short, fills leftmost (MSB) bits with 0.
      """
      number = 0
      for char in string[::-1]:
          value = _ALPHABET.index(char)
          number = number * len(_ALPHABET) + value
      return _uu.UUID(int=number)
  
  def uuid(name=None):
      """
      Generate and return a UUID.
  
      If the name parameter is provided, set the namespace to the provided
      name and generate a UUID.
      """
      # If no name is given, generate a random UUID.
      if name is None:
          uuid = _uu.uuid4()
      elif not "http" in name:
          uuid = _uu.uuid5(_uu.NAMESPACE_DNS, name)
      else:
          uuid = _uu.uuid5(_uu.NAMESPACE_URL, name)
      return encode(uuid)
  
  def get_alphabet():
      """Return the current alphabet used for new UUIDs."""
      return _ALPHABET
  
  def set_alphabet(alphabet):
      """Set the alphabet to be used for new UUIDs."""
      global _ALPHABET
  
      try:
         set
      except NameError:
         from sets import Set as set
  
      # Turn the alphabet into a set and sort it to prevent duplicates
      # and ensure reproducibility.
      new_alphabet = "".join(sorted(set(alphabet)))
      if len(new_alphabet) > 1:
          _ALPHABET = new_alphabet
      else:
          raise ValueError("Alphabet with more than one unique symbols required.")
  
subject: Change some stylistic things.