def calc_yesterday(dates, dates_d=None):
""" Given a list of date strings from a report, find "yesterday"
and return it in datetime and string form. Dates are always in order
on input. Return "yesterday" in both datetime.date and %Y-%m-%d format.
"yesterday" is the next to last date with registrations if still in
a registration period, or the last date with registrations otherwise.
If the dates are already available as date objects, pass that in as dates_d.
If there haven't been any registrations, dates will be empty; return
None, None.
"""
if not dates:
return None, None
if dates_d is None:
dates_d = parse_dates(dates)
today = now().date()
if len(dates) > 1 and registration_in_progress(as_of=today):
# registration ongoing, use day before most recent
yesterday_date_str = dates[-2] # not true if still in signup
yesterday_date = dates_d[-2]
else:
# registration finished, final day of data
yesterday_date_str = dates[-1]
yesterday_date = dates_d[-1]
return yesterday_date, yesterday_date_str
def test_yesterday_general(self):
today = now()
first_dt = today - datetime.timedelta(7)
input_strings = [(first_dt + datetime.timedelta(delta_days)).strftime('%Y-%m-%d')
for delta_days in range(7)]
# the behavior depends on the current datetime relative to registration end,
# so try it with registration end before and after the current time
reg_period = RegistrationPeriodFactory(start_time=today - datetime.timedelta(days=5),
end_time=today)
for fake_registration_end in [today - datetime.timedelta(days=1),
today + datetime.timedelta(days=1)]:
reg_period.end_time = fake_registration_end
reg_period.save()
if registration_in_progress(as_of=today.date()):
expected_str = input_strings[-2]
else:
expected_str = input_strings[-1]
expected_date = datetime.datetime.strptime(expected_str, '%Y-%m-%d').date()
date_and_string = calc_yesterday(input_strings)
self.assertEqual(date_and_string, (expected_date, expected_str))
# try again, providing the date objects
input_dates = [datetime.datetime.strptime(s, '%Y-%m-%d').date()
for s in input_strings]
date_and_string = calc_yesterday(input_strings, input_dates)
self.assertEqual(date_and_string, (expected_date, expected_str))