按年，月或日过滤日期列表

Question

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, 5, 13), dt.date(2012, 12, 6), dt.date(2017, 12, 6)]

Answer 1

import datetime as dt

dates = [dt.date(2017, 5, 6), dt.date(2015, 5, 13), dt.date(2012, 12, 6), dt.date(2017, 12, 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))