old_contents: # -*- coding: utf-8 -*-
  
  # Copyright (c) 2012-2018, Ben Lopatin and contributors
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  #
  # Redistributions of source code must retain the above copyright notice, this
  # list of conditions and the following disclaimer.  Redistributions in binary
  # form must reproduce the above copyright notice, this list of conditions and the
  # following disclaimer in the documentation and/or other materials provided with
  # the distribution
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  import django.dispatch
  
  user_kwargs = {"providing_args": ["user"]}
  user_added = django.dispatch.Signal(**user_kwargs)
  user_removed = django.dispatch.Signal(**user_kwargs)
  
  owner_kwargs = {"providing_args": ["old", "new"]}
  owner_changed = django.dispatch.Signal(**owner_kwargs)
  
new_contents: # -*- coding: utf-8 -*-
  
  # Copyright (c) 2012-2018, Ben Lopatin and contributors
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  #
  # Redistributions of source code must retain the above copyright notice, this
  # list of conditions and the following disclaimer.  Redistributions in binary
  # form must reproduce the above copyright notice, this list of conditions and the
  # following disclaimer in the documentation and/or other materials provided with
  # the distribution
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  import django.dispatch
  
  user_kwargs = {"providing_args": ["user"]}
  user_added = django.dispatch.Signal(**user_kwargs)
  user_removed = django.dispatch.Signal(**user_kwargs)
  
  invitation_accepted = django.dispatch.Signal()
  
  owner_kwargs = {"providing_args": ["old", "new"]}
  owner_changed = django.dispatch.Signal(**owner_kwargs)
  
subject: Add invitation_accepted signal