def _iter_month_interest(start_date, end_date, year_interest):
year_interest = Decimal(year_interest) / 100
prev = None
day_interest = None
for cur in _iter_months(start_date, end_date):
if prev is None:
day_interest = year_interest / year_days(cur.year)
prev = cur
continue
if cur.year == prev.year:
interest = day_interest * (cur - prev).days
else:
assert prev.month == 12
assert cur.month == 1
prev_days = (Date(prev.year, prev.month, 31) - prev).days
cur_days = (cur - Date(cur.year, cur.month, 1)).days + 1
assert prev_days + cur_days == (cur - prev).days
interest = day_interest * prev_days
day_interest = year_interest / year_days(cur.year)
interest += day_interest * cur_days
yield MonthInterest(cur, interest)
prev = cur
def _iter_month_interest(start_date, end_date, year_interest):
year_interest = Decimal(year_interest) / 100
prev = None
day_interest = None
for cur in _iter_months(start_date, end_date):
if prev is None:
day_interest = year_interest / year_days(cur.year)
prev = cur
continue
if cur.year == prev.year:
interest = day_interest * (cur - prev).days
else:
assert prev.month == 12
assert cur.month == 1
prev_days = (Date(prev.year, prev.month, 31) - prev).days
cur_days = (cur - Date(cur.year, cur.month, 1)).days + 1
assert prev_days + cur_days == (cur - prev).days
interest = day_interest * prev_days
day_interest = year_interest / year_days(cur.year)
interest += day_interest * cur_days
yield MonthInterest(cur, interest)
prev = cur
def test_year_days():
assert year_days(2012) == 366
assert year_days(2013) == 365
def test_year_days():
assert year_days(2012) == 366
assert year_days(2013) == 365