old_contents: # ci.py - functions for handling Ecuadorian personal identity codes
  # coding: utf-8
  #
  # Copyright (C) 2014 Jonathan Finlay
  # Copyright (C) 2014-2017 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
  
  """CI (Cédula de identidad, Ecuadorian personal identity code).
  
  The CI is a 10 digit number used to identify Ecuadorian citizens.
  
  >>> validate('171430710-3')
  '1714307103'
  >>> validate('1714307104')  # invalid check digit
  Traceback (most recent call last):
      ...
  InvalidChecksum: ...
  >>> validate('171430710')  # digit missing
  Traceback (most recent call last):
      ...
  InvalidLength: ...
  """
  
  from stdnum.exceptions import *
  from stdnum.util import clean, isdigits
  
  
  def compact(number):
      """Convert the number to the minimal representation. This strips the
      number of any valid separators and removes surrounding whitespace."""
      return clean(number, ' -').upper().strip()
  
  
  def _checksum(number):
      """Calculate a checksum over the number."""
      fold = lambda x: x - 9 if x > 9 else x
      return sum(fold((2, 1)[i % 2] * int(n))
                 for i, n in enumerate(number)) % 10
  
  
  def validate(number):
      """Check if the number provided is a valid CI number. This checks the
      length, formatting and check digit."""
      number = compact(number)
      if len(number) != 10:
          raise InvalidLength()
      if not isdigits(number):
          raise InvalidFormat()
      if (number[:2] < '01' or number[:2] > '24') and (number[:2] not in ('30', '50')):
          raise InvalidComponent()  # invalid province code
      if number[2] > '5':
          raise InvalidComponent()  # third digit wrong
      if _checksum(number) != 0:
          raise InvalidChecksum()
      return number
  
  
  def is_valid(number):
      """Check if the number provided is a valid CI number. This checks the
      length, formatting and check digit."""
      try:
          return bool(validate(number))
      except ValidationError:
          return False
  
new_contents: # ci.py - functions for handling Ecuadorian personal identity codes
  # coding: utf-8
  #
  # Copyright (C) 2014 Jonathan Finlay
  # Copyright (C) 2014-2017 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
  
  """CI (Cédula de identidad, Ecuadorian personal identity code).
  
  The CI is a 10 digit number used to identify Ecuadorian citizens.
  
  >>> validate('171430710-3')
  '1714307103'
  >>> validate('1714307104')  # invalid check digit
  Traceback (most recent call last):
      ...
  InvalidChecksum: ...
  >>> validate('171430710')  # digit missing
  Traceback (most recent call last):
      ...
  InvalidLength: ...
  """
  
  from stdnum.exceptions import *
  from stdnum.util import clean, isdigits
  
  
  def compact(number):
      """Convert the number to the minimal representation. This strips the
      number of any valid separators and removes surrounding whitespace."""
      return clean(number, ' -').upper().strip()
  
  
  def _checksum(number):
      """Calculate a checksum over the number."""
      fold = lambda x: x - 9 if x > 9 else x
      return sum(fold((2, 1)[i % 2] * int(n))
                 for i, n in enumerate(number)) % 10
  
  
  def validate(number):
      """Check if the number provided is a valid CI number. This checks the
      length, formatting and check digit."""
      number = compact(number)
      if len(number) != 10:
          raise InvalidLength()
      if not isdigits(number):
          raise InvalidFormat()
      if (number[:2] < '01' or number[:2] > '24') and (number[:2] not in ('30', '50')):
          raise InvalidComponent()  # invalid province code
      if number[2] > '6':
          raise InvalidComponent()  # third digit wrong
      if _checksum(number) != 0:
          raise InvalidChecksum()
      return number
  
  
  def is_valid(number):
      """Check if the number provided is a valid CI number. This checks the
      length, formatting and check digit."""
      try:
          return bool(validate(number))
      except ValidationError:
          return False
  
subject: Support 6 as third digit for foreign people in Ecuador