old_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.utils.translation import ugettext_lazy as _
  
  
  def get_display_name(user):
      """
      Tries to return (in order):
  
          * ``user.profile.display_name``
          * ``user.username``
      """
      if user is None:
          return None
      profile = user.profile
      if profile.display_name:
          return profile.display_name
      return user.username
  
  
  def get_full_name(user):
      """
      Tries to return (in order):
  
          * ``user.profile.addressed_as``
          * ``user.profile.display_name``
          * ``user.username``
      """
      if user is None:
          return None
      profile = user.profile
      if profile.full_name:
          return profile.full_name
      return get_display_name(user)
  
  
  def get_addressed_as(user):
      """
      Tries to return (in order):
  
          * ``user.profile.addressed_as``
          * ``user.profile.display_name``
          * ``user.username``
      """
      if user is None:
          return None
      profile = user.profile
      if profile.addressed_as:
          return profile.addressed_as
      return get_display_name(user)
  
  
  _valid_purchase = ('invoice_created', 'payment_received')
  
  _SEND_MAIL_MAP = (
      ('', _('Please select the target group'), None),
      (
          'all',
          _('All registered users'),
          lambda qs: qs
      ),
      (
          'buyers',
          _('All users having valid purchases'),
          lambda qs: qs.filter(purchase__state__in=_valid_purchase)
                       .distinct()
      ),
      (
          'ticket_holder',
          _('All users having at least one ticket directly assigned'),
          lambda qs: qs.filter(attendees_ticket_tickets__isnull=False,
                               attendees_ticket_tickets__purchase__state__in=_valid_purchase)
                       .distinct()
      ),
  )
  
  SEND_MAIL_CHOICES = tuple((i[0], i[1]) for i in _SEND_MAIL_MAP)
  SEND_MAIL_FILTERS = {i[0]: i[2] for i in _SEND_MAIL_MAP}
  
new_contents: # -*- coding: utf-8 -*-
  from __future__ import unicode_literals
  
  from django.utils.translation import ugettext_lazy as _
  
  
  def get_display_name(user):
      """
      Tries to return (in order):
  
          * ``user.profile.display_name``
          * ``user.username``
      """
      if user is None:
          return None
      profile = user.profile
      if profile.display_name:
          return profile.display_name
      return user.username
  
  
  def get_full_name(user):
      """
      Tries to return (in order):
  
          * ``user.profile.full_name``
          * ``user.profile.display_name``
          * ``user.username``
      """
      if user is None:
          return None
      profile = user.profile
      if profile.full_name:
          return profile.full_name
      return get_display_name(user)
  
  
  def get_addressed_as(user):
      """
      Tries to return (in order):
  
          * ``user.profile.addressed_as``
          * ``user.profile.display_name``
          * ``user.username``
      """
      if user is None:
          return None
      profile = user.profile
      if profile.addressed_as:
          return profile.addressed_as
      return get_display_name(user)
  
  
  _valid_purchase = ('invoice_created', 'payment_received')
  
  _SEND_MAIL_MAP = (
      ('', _('Please select the target group'), None),
      (
          'all',
          _('All registered users'),
          lambda qs: qs
      ),
      (
          'buyers',
          _('All users having valid purchases'),
          lambda qs: qs.filter(purchase__state__in=_valid_purchase)
                       .distinct()
      ),
      (
          'ticket_holder',
          _('All users having at least one ticket directly assigned'),
          lambda qs: qs.filter(attendees_ticket_tickets__isnull=False,
                               attendees_ticket_tickets__purchase__state__in=_valid_purchase)
                       .distinct()
      ),
  )
  
  SEND_MAIL_CHOICES = tuple((i[0], i[1]) for i in _SEND_MAIL_MAP)
  SEND_MAIL_FILTERS = {i[0]: i[2] for i in _SEND_MAIL_MAP}
  
subject: Fix comment