找到最近的小时

Question

我有一个包含这些项目的列表:

hours = ['19:30', '20:10', '20:30', '21:00', '22:00']

假设现在是20:18,我如何从列表中获得'20:10'项？我想用它来查找电视指南中当前正在播放的节目.

Answer 1

>>> import datetime
>>> hours = ['19:30', '20:10', '20:30', '21:00', '22:00']
>>> now = datetime.datetime.strptime("20:18", "%H:%M")
>>> min(hours, key=lambda t: abs(now - datetime.datetime.strptime(t, "%H:%M")))
'20:10'

Answer 2

容易但脏的方式

max(t for t in sorted(hours) if t<=now)