Create date range using recursive function won't return values

Asked Oct 03 '22 at 19:48

Active Oct 03 '22 at 20:13

Viewed 20 times

I am trying to build a function that creates a list of start and end dates. I am implementing it using a recursive function. Problem is my list isn't returned. When I run the code below:

from dateutil import parser

def dateinterval(listing_date, dates=[]):
    period = 1000

    dates.append(listing_date)
    base = parser.parse(listing_date)
    next_date = base + datetime.timedelta(days=period)
    dates.append(next_date.strftime('%Y-%m-%d'))
    if base > datetime.datetime.now():
        dates.append(datetime.datetime.now().strftime('%Y-%m-%d'))
        print dates
        return dates
    dateinterval(next_date.strftime('%Y-%m-%d'), dates)


a = dateinterval('2017-01-01')
print(a)

I get the following result:

['2017-01-01', '2019-09-28', '2019-09-28', '2022-06-24', '2022-06-24', '2025-03-20', '2025-03-20', '2027-12-15', '2022-10-03']
None

What am I missing?

edited Oct 03 '22 at 20:13

asked Oct 03 '22 at 19:48

A39-A20

You need to return your dates. – quamrana Oct 03 '22 at 19:50
what is `parser.parse` method does ? Or you could give more information about your desired output. – Rahul K P Oct 03 '22 at 19:55
@quamrana isn’t it enough to return the dates within the if-statement? – A39-A20 Oct 03 '22 at 20:12
No. You should study the principles of recursive functions first. There is the base case and the recursive case. Both need to return. – quamrana Oct 03 '22 at 20:14
@RahulKP I edited the post so it includes my imports. – A39-A20 Oct 03 '22 at 20:14
@quamrana aha! I thought it was enough to make a function call. Thank you for pointing me in the right direction, I will study the recursive case. – A39-A20 Oct 03 '22 at 20:18

Create date range using recursive function won't return values

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