text: from uuid import UUID
  
  
  def validate_uuid4(uuid_string):
      """
      Validate that a UUID string is in
      fact a valid uuid4.
      Happily, the uuid module does the actual
      checking for us.
      It is vital that the 'version' kwarg be passed
      to the UUID() call, otherwise any 32-character
      hex string is considered valid.
      """
  
      try:
          val = UUID(uuid_string, version=4)
          suuid = uuid_string.replace('-', '')
      except ValueError:
          # If it's a value error, then the string
          # is not a valid hex code for a UUID.
          return False
  
      # If the uuid_string is a valid hex code,
      # but an invalid uuid4,
      # the UUID.__init__ will convert it to a
      # valid uuid4. This is bad for validation purposes.
  
      return val.hex == suuid