[英]Sort a list of dictionaries of dates by value
I'm trying to sort the values with current year.我正在尝试对当前年份的值进行排序。
Current year values should show first.当前年份值应首先显示。
mdlist = [{0:'31 Jan 2022', 1:'', 2:'10 Feb 2022'},
{0:'10 Feb 2021', 1:'20, Feb 2021', 2:''},
{0:'10 Feb 2022', 1:'10 Feb 2022', 2:'10 Feb 2022'}]
mdlist = sorted(mdlist, key=lambda d:d[0])
but it is not working as expected但它没有按预期工作
expected output:预计 output:
mdlist = [{0:'31 Jan 2022', 1:'', 2:'10 Feb 2022'},
{0:'10 Feb 2022', 1:'10 Feb 2022', 2:'10 Feb 2022'},
{0:'10 Feb 2021', 1:'20 Feb 2021', 2:''}]
Maybe you could leverage the fact that these are datetimes by using the datetime
module and sort it by the years in descending order and the month-days in ascending order:也许您可以通过使用datetime
模块来利用这些是日期时间这一事实,并按年份降序排序,月-日按升序排序:
from datetime import datetime
def sorting_key(dct):
ymd = datetime.strptime(dct[0], "%d %b %Y")
return -ymd.year, ymd.month, ymd.day
mdlist.sort(key=sorting_key)
Output: Output:
[{0: '31 Jan 2022', 1: '', 2: '10 Feb 2022'},
{0: '10 Feb 2022', 1: '10 Feb 2022', 2: '10 Feb 2022'},
{0: '10 Feb 2021', 1: '20 Feb 2021', 2: ''}]
Use a key
function that returns 0
if the year is 2022
, 1
otherwise.使用key
function 如果年份是2022
则返回0
,否则返回1
。 This will sort all the 2022 dates first.这将首先对所有 2022 年的日期进行排序。
firstyear = '2022'
mdlist = sorted(mdlist, key=lambda d: 0 if d:d[0].split()[-1] == firstyear else 1)
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