起源于一个比较奇葩的需求，默认的celery无法实现：
需要用户输入一个开始时间，结束时间，以及时间间隔，需要在该时间段内指定间隔执行
import datetime
def task(start: datetime.datetime, end: datetime.datetime, interval: datetime.timedelta):
"""
* * * * *
"""
time_list = []
result_dict = {}
today = datetime.datetime.now()
current = start
while current < end:
current_time = current.time()
time_list.append(current_time)
current += interval
for i in time_list:
if i.hour not in result_dict:
result_dict[i.hour] = []
result_dict[i.hour].append(i)
for k, v in result_dict.items():
m_list = []
for j in v:
m_list.append(str(j.minute))
print(f"{','.join(m_list)} {k} {today.day} {today.month} *")
if __name__ == '__main__':
time2 = "15:16:08"
time4 = "18:16:08"
start_time = datetime.datetime.strptime(time2, "%H:%M:%S")
end_time = datetime.datetime.strptime(time4, "%H:%M:%S")
task(start_time, end_time, datetime.timedelta(seconds=420))
作者：前方、有光
