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Return inherited type #14

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yankyhoffman wants to merge 4 commits into from
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Return inherited type #14

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8ec9fa8
Create failing test
yankyhoffman Mar 5, 2023
c5edaee
Use instance's type to construct return instance
yankyhoffman Mar 5, 2023
8007cea
Remove type tests from calendar tests
yankyhoffman Mar 6, 2023
135c7bb
Test in jewish date tests with dummy child class
yankyhoffman Mar 6, 2023
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9 changes: 9 additions & 0 deletions test/test_jewish_date.py
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Original file line number Diff line number Diff line change
Expand Up @@ -649,3 +649,12 @@ def test_jewish_month_name_defaults_to_current_month(self):
self.assertEqual(subject.jewish_month_name(), 'sivan')
subject.jewish_month = 8
self.assertEqual(subject.jewish_month_name(), 'cheshvan')

def test_date_arithmetic_returns_inherited_type(self):
class JewishDateChild(JewishDate):
pass

for instance, type in [(JewishDateChild(5783, 1, 1), JewishDateChild), (JewishDate(5783, 1, 1), JewishDate)]:
self.assertIsInstance(instance, type)
instance += timedelta(days=1)
self.assertIsInstance(instance, type)
6 changes: 3 additions & 3 deletions zmanim/hebrew_calendar/jewish_date.py
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Expand Up @@ -227,14 +227,14 @@ def __add__(self, addend) -> 'JewishDate':
if isinstance(addend, int):
return copy.copy(self).forward(addend)
elif isinstance(addend, timedelta):
return JewishDate(self.gregorian_date + addend)
return type(self)(self.gregorian_date + addend)
raise ValueError

def __sub__(self, subtrahend):
if isinstance(subtrahend, int):
return copy.copy(self).back(subtrahend)
elif isinstance(subtrahend, timedelta):
return JewishDate(self.gregorian_date - subtrahend)
return type(self)(self.gregorian_date - subtrahend)
elif isinstance(subtrahend, JewishDate):
return self.gregorian_date - subtrahend.gregorian_date
elif isinstance(subtrahend, date):
Expand Down Expand Up @@ -535,4 +535,4 @@ def _chalakim_since_molad_tohu(year: int, month: int) -> int:
@staticmethod
def _month_number_from_tishrei(year: int, month: int) -> int:
leap = JewishDate._is_jewish_leap_year(year)
return 1 + ((month + (6 if leap else 5)) % (13 if leap else 12))
return 1 + ((month + (6 if leap else 5)) % (13 if leap else 12))