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我已经安装了 django-geckoboard easy_install django-geckoboard ,我正在创建一个自定义小部件来计算评论(number_widget),但显示导入错误cannot import name simplejson

我附上代码。

from datetime import date, time, datetime
from django.contrib.comments.models import Comment
from django_geckoboard.decorators import number_widget


@number_widget(format='xml')
def comment_count(request):
    midnight = datatime.combine(date.today(), time.min)
    return Comment.objects.filter(submit_data__get=midnight).count()`
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