如何使用列表值创建嵌套字典？

Question

I have the follow two queryset:

opus = Work_Music.objects.filter(composerwork__person=self.kwargs['pk'], level=0).order_by('date_completed')
event = LifeEvent.objects.filter(person=self.kwargs['pk']).order_by('date_end')

The first pulls the work of a composer and the second pulls his life events.

I want to create a nested dictionary: The first level is keyed by year. The second level has two keys 'work' and 'life'. It should be a list of values because there could be multiple work and events in a given year.

I have written following:

    # timeline = defaultdict(list)
    timeline = dict()
    for o in opus:
        if o.date_comp_f not in timeline:
            timeline[o.date_comp_f] = {}
            timeline[o.date_comp_f]['work'] = {}
            timeline[o.date_comp_f]['work'].append(o)
        else:
            timeline[o.date_comp_f]['work'].append(o)
    for e in event:
        if e.date_end_y not in timeline:
            timeline[e.date_end_y] = {}
            timeline[e.date_end_y]['life'] = {}
            timeline[e.date_end_y]['life'].append(e)
        else:
            timeline[e.date_end_y]['life'].append(e)
    timeline = dict(timeline)

I also want to sort the first level key in chronological order. How do I do this? I keep getting Key errors.

Answer 1

You were using {} when you wanted to use a list? I'm guessing this was a typo, but here is the fix (with a few simplifications):

# timeline = defaultdict(list)
timeline = dict()
for o in opus:
    if o.date_comp_f not in timeline:
        timeline[o.date_comp_f] = {}
        timeline[o.date_comp_f]['work'] = []
    timeline[o.date_comp_f]['work'].append(o)
for e in event:
    if e.date_end_y not in timeline:
        timeline[e.date_end_y] = {}
        timeline[e.date_end_y]['life'] = []
    timeline[e.date_end_y]['life'].append(e)

timeline = dict(timeline)

If this doesn't work, (which I assume it doesn't) can you please provide the Work_Music and LifeEvents models?