# 计算时间
time = datetime.datetime.now() - relativedelta(years=1)
# 获取近一年数据
one_year_data = Data.objects.filter(create_time__gte=time_ago)
# 分组统计每个月的数据
count_res = one_year_data			.annotate(year=ExtractYear('create_time'),month=ExtractMonth('create_time'))      .values('year', 'month').order_by('year', 'month').annotate(count=Count('id'))
print(count_res)

<QuerySet [{'year': 2018, 'month': 7, 'count': 3}, {'year': 2019, 'month': 5, 'count': 7}, {'year': 2019, 'month': 6, 'count': 161}]>