规则可以在半小时开始吗?

Question

是否有可能创建一个规则，每30分钟运行一次，但在一个小时的中间开始和结束?如果rrule能接受像byhour=range(16.5,19)这样的非整数参数，那就太好了，但不幸的是只能接受整数。

在我的情况下，时间是每个工作日的16:30,17:00,17:30,18:00和18:30。我能做的就是从16:00到18:30如下:

from dateutil.rrule import *
from dateutil.parser import parse
list(rrule(MINUTELY, interval=30, count=20, byhour=range(16,19), byminute=(0,30), byweekday=(MO,TU,WE,TH,FR), dtstart=parse("20220602T070000")))

…结果如下:

[datetime.datetime(2022, 6, 2, 16, 0),
datetime.datetime(2022, 6, 2, 16, 30),
datetime.datetime(2022, 6, 2, 17, 0),
datetime.datetime(2022, 6, 2, 17, 30),
datetime.datetime(2022, 6, 2, 18, 0),
datetime.datetime(2022, 6, 2, 18, 30),
datetime.datetime(2022, 6, 3, 16, 0),
datetime.datetime(2022, 6, 3, 16, 30),
datetime.datetime(2022, 6, 3, 17, 0),
datetime.datetime(2022, 6, 3, 17, 30),
datetime.datetime(2022, 6, 3, 18, 0),
datetime.datetime(2022, 6, 3, 18, 30),
datetime.datetime(2022, 6, 6, 16, 0),
datetime.datetime(2022, 6, 6, 16, 30),
datetime.datetime(2022, 6, 6, 17, 0),
datetime.datetime(2022, 6, 6, 17, 30),
datetime.datetime(2022, 6, 6, 18, 0),
datetime.datetime(2022, 6, 6, 18, 30),
datetime.datetime(2022, 6, 7, 16, 0),
datetime.datetime(2022, 6, 7, 16, 30)]

我希望rrule比crontab更灵活…

Answer 1

我找到了一个使用rrset.exrule的解决方案:

from dateutil.rrule import *
from dateutil.parser import parse
myrrule = rrule(MINUTELY, interval=30, count=20, byhour=range(16,19), byminute=(0,30), byweekday=(MO,TU,WE,TH,FR), dtstart=parse("20220602T070000"))
myexrule = rrule(DAILY, interval=1, count=4, byhour=16, byminute=0, byweekday=(MO,TU,WE,TH,FR), dtstart=parse("20220602T070000"))
rrset = rruleset()
rrset.rrule(myrrule)
rrset.exrule(myexrule)
list(rrset)

，结果如下:

[datetime.datetime(2022, 6, 2, 16, 30),
datetime.datetime(2022, 6, 2, 17, 0),
datetime.datetime(2022, 6, 2, 17, 30),
datetime.datetime(2022, 6, 2, 18, 0),
datetime.datetime(2022, 6, 2, 18, 30),
datetime.datetime(2022, 6, 3, 16, 30),
datetime.datetime(2022, 6, 3, 17, 0),
datetime.datetime(2022, 6, 3, 17, 30),
datetime.datetime(2022, 6, 3, 18, 0),
datetime.datetime(2022, 6, 3, 18, 30),
datetime.datetime(2022, 6, 6, 16, 30),
datetime.datetime(2022, 6, 6, 17, 0),
datetime.datetime(2022, 6, 6, 17, 30),
datetime.datetime(2022, 6, 6, 18, 0),
datetime.datetime(2022, 6, 6, 18, 30),
datetime.datetime(2022, 6, 7, 16, 30)]