docs: def remove_resources(self, resources):
      """
      Removes resources from the event.
  
      *resources* can be a list of email addresses or :class:`ExchangeEventAttendee` objects.
      """
  
      resources_to_delete = self._build_resource_dictionary(resources)
      for email in resources_to_delete.keys():
        if email in self._resources:
          del self._resources[email]
  
      self._dirty_attributes.add(u'resources')