如何按特定的年，月或日过滤datetime.date对象的列表？
示例：
import datetime as dt
dates = [dt.date(2017,5,6),dt.date(2015,13),dt.date(2012,12,dt.date(2017,6)]
按年，月或日过滤日期列表
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问答
super_1987cl 回答：按年，月或日过滤日期列表
import datetime as dt
dates = [dt.date(2017,5,6),dt.date(2015,13),dt.date(2012,12,dt.date(2017,6)]
# Filter by year
dates_2017 = list(filter(lambda x: x.year == 2017,dates))
# Filter by month
dates_may = list(filter(lambda x: x.month == 5,dates))
# Filter by day
dates_6th = list(filter(lambda x: x.day == 6,dates))