class BaseDateListView

def __init__(self, **kwargs):
    """
    Constructor. Called in the URLconf; can contain helpful extra
    keyword arguments, and other things.
    """
    # Go through keyword arguments, and either save their values to our
    # instance, or raise an error.
    for key, value in six.iteritems(kwargs):
        setattr(self, key, value)

def _allowed_methods(self):
    return [m.upper() for m in self.http_method_names if hasattr(self, m)]

def _make_date_lookup_arg(self, value):
    """
    Convert a date into a datetime when the date field is a DateTimeField.
    When time zone support is enabled, `date` is assumed to be in the
    current time zone, so that displayed items are consistent with the URL.
    """
    if self.uses_datetime_field:
        value = datetime.datetime.combine(value, datetime.time.min)
        if settings.USE_TZ:
            value = timezone.make_aware(value, timezone.get_current_timezone())
    return value

def _make_single_date_lookup(self, date):
    """
    Get the lookup kwargs for filtering on a single date.
    If the date field is a DateTimeField, we can't just filter on
    date_field=date because that doesn't take the time into account.
    """
    date_field = self.get_date_field()
    if self.uses_datetime_field:
        since = self._make_date_lookup_arg(date)
        until = self._make_date_lookup_arg(date + datetime.timedelta(days=1))
        return {
            '%s__gte' % date_field: since,
            '%s__lt' % date_field: until,
        }
    else:
        # Skip self._make_date_lookup_arg, it's a no-op in this branch.
        return {date_field: date}

@classonlymethod
def as_view(cls, **initkwargs):
    """
    Main entry point for a request-response process.
    """
    # sanitize keyword arguments
    for key in initkwargs:
        if key in cls.http_method_names:
            raise TypeError("You tried to pass in the %s method name as a "
                            "keyword argument to %s(). Don't do that."
                            % (key, cls.__name__))
        if not hasattr(cls, key):
            raise TypeError("%s() received an invalid keyword %r. as_view "
                            "only accepts arguments that are already "
                            "attributes of the class." % (cls.__name__, key))
    def view(request, *args, **kwargs):
        self = cls(**initkwargs)
        if hasattr(self, 'get') and not hasattr(self, 'head'):
            self.head = self.get
        self.request = request
        self.args = args
        self.kwargs = kwargs
        return self.dispatch(request, *args, **kwargs)
    # take name and docstring from class
    update_wrapper(view, cls, updated=())
    # and possible attributes set by decorators
    # like csrf_exempt from dispatch
    update_wrapper(view, cls.dispatch, assigned=())
    return view

def dispatch(self, request, *args, **kwargs):
    # Try to dispatch to the right method; if a method doesn't exist,
    # defer to the error handler. Also defer to the error handler if the
    # request method isn't on the approved list.
    if request.method.lower() in self.http_method_names:
        handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
    else:
        handler = self.http_method_not_allowed
    return handler(request, *args, **kwargs)

def get(self, request, *args, **kwargs):
    self.date_list, self.object_list, extra_context = self.get_dated_items()
    context = self.get_context_data(object_list=self.object_list,
                                    date_list=self.date_list)
    context.update(extra_context)
    return self.render_to_response(context)

def get_allow_empty(self):
    """
    Returns ``True`` if the view should display empty lists, and ``False``
    if a 404 should be raised instead.
    """
    return self.allow_empty

def get_allow_future(self):
    """
    Returns `True` if the view should be allowed to display objects from
    the future.
    """
    return self.allow_future

def get_context_object_name(self, object_list):
    """
    Get the name of the item to be used in the context.
    """
    if self.context_object_name:
        return self.context_object_name
    elif hasattr(object_list, 'model'):
        return '%s_list' % object_list.model._meta.model_name
    else:
        return None

def get_date_field(self):
    """
    Get the name of the date field to be used to filter by.
    """
    if self.date_field is None:
        raise ImproperlyConfigured("%s.date_field is required." % self.__class__.__name__)
    return self.date_field

def get_date_list(self, queryset, date_type=None, ordering='ASC'):
    """
    Get a date list by calling `queryset.dates/datetimes()`, checking
    along the way for empty lists that aren't allowed.
    """
    date_field = self.get_date_field()
    allow_empty = self.get_allow_empty()
    if date_type is None:
        date_type = self.get_date_list_period()
    if self.uses_datetime_field:
        date_list = queryset.datetimes(date_field, date_type, ordering)
    else:
        date_list = queryset.dates(date_field, date_type, ordering)
    if date_list is not None and not date_list and not allow_empty:
        name = force_text(queryset.model._meta.verbose_name_plural)
        raise Http404(_("No %(verbose_name_plural)s available") %
                      {'verbose_name_plural': name})
    return date_list

def get_date_list_period(self):
    """
    Get the aggregation period for the list of dates: 'year', 'month', or 'day'.
    """
    return self.date_list_period

def get_dated_items(self):
    """
    Obtain the list of dates and items.
    """
    raise NotImplementedError('A DateView must provide an implementation of get_dated_items()')

def get_dated_queryset(self, ordering=None, **lookup):
    """
    Get a queryset properly filtered according to `allow_future` and any
    extra lookup kwargs.
    """
    qs = self.get_queryset().filter(**lookup)
    date_field = self.get_date_field()
    allow_future = self.get_allow_future()
    allow_empty = self.get_allow_empty()
    paginate_by = self.get_paginate_by(qs)
    if ordering is not None:
        qs = qs.order_by(ordering)
    if not allow_future:
        now = timezone.now() if self.uses_datetime_field else timezone_today()
        qs = qs.filter(**{'%s__lte' % date_field: now})
    if not allow_empty:
        # When pagination is enabled, it's better to do a cheap query
        # than to load the unpaginated queryset in memory.
        is_empty = len(qs) == 0 if paginate_by is None else not qs.exists()
        if is_empty:
            raise Http404(_("No %(verbose_name_plural)s available") % {
                'verbose_name_plural': force_text(qs.model._meta.verbose_name_plural)
            })
    return qs

def get_paginate_by(self, queryset):
    """
    Get the number of items to paginate by, or ``None`` for no pagination.
    """
    return self.paginate_by

def get_paginate_orphans(self):
    """
    Returns the maximum number of orphans extend the last page by when
    paginating.
    """
    return self.paginate_orphans

def get_paginator(self, queryset, per_page, orphans=0,
                  allow_empty_first_page=True, **kwargs):
    """
    Return an instance of the paginator for this view.
    """
    return self.paginator_class(
        queryset, per_page, orphans=orphans,
        allow_empty_first_page=allow_empty_first_page, **kwargs)

def get_queryset(self):
    """
    Return the list of items for this view.
    The return value must be an iterable and may be an instance of
    `QuerySet` in which case `QuerySet` specific behavior will be enabled.
    """
    if self.queryset is not None:
        queryset = self.queryset
        if isinstance(queryset, QuerySet):
            queryset = queryset.all()
    elif self.model is not None:
        queryset = self.model._default_manager.all()
    else:
        raise ImproperlyConfigured(
            "%(cls)s is missing a QuerySet. Define "
            "%(cls)s.model, %(cls)s.queryset, or override "
            "%(cls)s.get_queryset()." % {
                'cls': self.__class__.__name__
            }
        )
    return queryset

def http_method_not_allowed(self, request, *args, **kwargs):
    logger.warning('Method Not Allowed (%s): %s', request.method, request.path,
        extra={
            'status_code': 405,
            'request': request
        }
    )
    return http.HttpResponseNotAllowed(self._allowed_methods())

def options(self, request, *args, **kwargs):
    """
    Handles responding to requests for the OPTIONS HTTP verb.
    """
    response = http.HttpResponse()
    response['Allow'] = ', '.join(self._allowed_methods())
    response['Content-Length'] = '0'
    return response

def paginate_queryset(self, queryset, page_size):
    """
    Paginate the queryset, if needed.
    """
    paginator = self.get_paginator(
        queryset, page_size, orphans=self.get_paginate_orphans(),
        allow_empty_first_page=self.get_allow_empty())
    page_kwarg = self.page_kwarg
    page = self.kwargs.get(page_kwarg) or self.request.GET.get(page_kwarg) or 1
    try:
        page_number = int(page)
    except ValueError:
        if page == 'last':
            page_number = paginator.num_pages
        else:
            raise Http404(_("Page is not 'last', nor can it be converted to an int."))
    try:
        page = paginator.page(page_number)
        return (paginator, page, page.object_list, page.has_other_pages())
    except InvalidPage as e:
        raise Http404(_('Invalid page (%(page_number)s): %(message)s') % {
            'page_number': page_number,
            'message': str(e)
        })