django 中对日期进行比较过滤

http://stackoverflow.com/questions/4606207/using-datetime-to-compare-with-dates-in-django

__lte, __gte, __lt, __gt are used for <=, >=, < and >

双下划线相信pythoner应该不陌生了  就是表示某种奇特的用法== 

lte lower than or equal

gte greater than or equal

lt lower than

gt greater than