old_contents: # cnp.py - functions for handling Croatian OIB numbers
  # coding: utf-8
  #
  # Copyright (C) 2012 Arthur de Jong
  #
  # This library is free software; you can redistribute it and/or
  # modify it under the terms of the GNU Lesser General Public
  # License as published by the Free Software Foundation; either
  # version 2.1 of the License, or (at your option) any later version.
  #
  # This library is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  # Lesser General Public License for more details.
  #
  # You should have received a copy of the GNU Lesser General Public
  # License along with this library; if not, write to the Free Software
  # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  # 02110-1301 USA
  
  """OIB (Osobni identifikacijski broj, Croatian identification number).
  
  The personal identification number is used to identify persons and legal
  entities in Croatia. It has 11 digits (sometimes prefixed by HR), contains
  no personal information and uses the ISO 7064 Mod 11, 10 checksum algorithm.
  
  >>> compact('HR 33392005961')
  '33392005961'
  >>> is_valid('33392005961')
  True
  >>> is_valid('33392005962')  # invalid check digit
  False
  """
  
  from stdnum.util import clean
  from stdnum.iso7064 import mod_11_10
  
  
  def compact(number):
      """Convert the number to the minimal representation. This strips the
      number of any valid separators and removes surrounding whitespace."""
      number = clean(number, ' -').upper().strip()
      if number.startswith('HR'):
          number = number[2:]
      return number
  
  
  def is_valid(number):
      """Checks to see if the number provided is a valid OIB number. This
      checks the length, formatting and check digit."""
      try:
          number = compact(number)
      except:
          return False
      return len(number) == 11 and number.isdigit() and \
             mod_11_10.is_valid(number)
  
new_contents: # cnp.py - functions for handling Croatian OIB numbers
  # coding: utf-8
  #
  # Copyright (C) 2012, 2013 Arthur de Jong
  #
  # This library is free software; you can redistribute it and/or
  # modify it under the terms of the GNU Lesser General Public
  # License as published by the Free Software Foundation; either
  # version 2.1 of the License, or (at your option) any later version.
  #
  # This library is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  # Lesser General Public License for more details.
  #
  # You should have received a copy of the GNU Lesser General Public
  # License along with this library; if not, write to the Free Software
  # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  # 02110-1301 USA
  
  """OIB (Osobni identifikacijski broj, Croatian identification number).
  
  The personal identification number is used to identify persons and legal
  entities in Croatia. It has 11 digits (sometimes prefixed by HR), contains
  no personal information and uses the ISO 7064 Mod 11, 10 checksum algorithm.
  
  >>> validate('HR 33392005961')
  '33392005961'
  >>> validate('33392005962')  # invalid check digit
  Traceback (most recent call last):
      ...
  InvalidChecksum: ...
  """
  
  from stdnum.exceptions import *
  from stdnum.iso7064 import mod_11_10
  from stdnum.util import clean
  
  
  def compact(number):
      """Convert the number to the minimal representation. This strips the
      number of any valid separators and removes surrounding whitespace."""
      number = clean(number, ' -').upper().strip()
      if number.startswith('HR'):
          number = number[2:]
      return number
  
  
  def validate(number):
      """Checks to see if the number provided is a valid OIB number. This
      checks the length, formatting and check digit."""
      number = compact(number)
      if not number.isdigit():
          raise InvalidFormat()
      if len(number) != 11:
          raise InvalidLength()
      mod_11_10.validate(number)
      return number
  
  
  def is_valid(number):
      """Checks to see if the number provided is a valid OIB number. This
      checks the length, formatting and check digit."""
      try:
          return bool(validate(number))
      except ValidationError:
          return False
  
subject: Implement validate() for Croatian numbers