python 统计每月用户注册量(总注册数)

背景：djiango项目，models.py中add_at的类型定义为DateTimeField格式；

class userinfo(models.Model):
 add_at = models.DateTimeField( )
 .......

view.py中，代码关键是设置好每月的起止时间，再按区间过滤和计数。

def get_reguser():
    regtotal = 0
    chart_data = []
    start_day = datetime.datetime(2013, 3, 1, 0, 0, 0, 0)
    now = datetime.datetime.now()
    cur_day = start_day
while cur_day < now:
        month = cur_day.month + 1
        year = cur_day.year
if month > 12:
            month = 1
            year = year + 1
        end_day = datetime.datetime(year, month, 1)
#
        regcount = userinfo.objects.filter(add_at__gt=cur_day, add_at__lt=end_day).count() #过滤并计数
        citem = {}
        citem['name'] = cur_day.strftime('%Y-%m')
        citem['val'] = regcount
        regtotal = regtotal + regcount
        chart_data.append(citem)
#
        cur_day = end_day

return regtotal,chart_data

贴心小棉袄最后再附上前端显示代码：

# 套用echart柱状图模板的数据格式
var data_x =  [{% for item in chart_data %}'{{item.name|safe}}',{%endfor%}];
var data_y =  [{% for item in chart_data %}'{{item.val|safe}}',{%endfor%}];

option = {
            title : {
                text: '**注册用户统计',
                subtext: '注册总人数{{reg_total}}',
                left: 'center'
            },
...
        }