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[dt] introduce 'NullDatetime' to represent invalid datetimes

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This commit is contained in:
Mike Fährmann
2025-10-15 22:42:29 +02:00
parent 0eb3c8a994
commit 21350c5084
3 changed files with 36 additions and 19 deletions
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33
test/test_dt.py
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@@ -44,14 +44,14 @@ class TestDatetime(unittest.TestCase):
_assert("2010-01-01T00:00:00Z" , d)
_assert("2010-01-01T00:00:00.123456Z" , d)
_assert(0 , dt.EPOCH)
_assert("" , dt.EPOCH)
_assert("foo", dt.EPOCH)
_assert(None , dt.EPOCH)
_assert(() , dt.EPOCH)
_assert([] , dt.EPOCH)
_assert({} , dt.EPOCH)
_assert((1, 2, 3), dt.EPOCH)
_assert(0 , dt.NONE)
_assert("" , dt.NONE)
_assert("foo", dt.NONE)
_assert(None , dt.NONE)
_assert(() , dt.NONE)
_assert([] , dt.NONE)
_assert({} , dt.NONE)
_assert((1, 2, 3), dt.NONE)
@unittest.skipIf(sys.hexversion < 0x30b0000,
"extended fromisoformat timezones")
@@ -101,7 +101,7 @@ class TestDatetime(unittest.TestCase):
self.assertEqual(f("1555816235"), value)
for value in ((), [], {}, None, ""):
self.assertEqual(f(value), dt.EPOCH)
self.assertEqual(f(value), dt.NONE)
self.assertEqual(f(value, "foo"), "foo")
def test_parse(self, f=dt.parse):
@@ -119,7 +119,7 @@ class TestDatetime(unittest.TestCase):
)
for value in ((), [], {}, None, 1, 2.3):
self.assertEqual(f(value, "%Y"), dt.EPOCH)
self.assertEqual(f(value, "%Y"), dt.NONE)
def test_parse_iso(self, f=dt.parse_iso):
null = dt.from_ts(0)
@@ -140,12 +140,16 @@ class TestDatetime(unittest.TestCase):
datetime.datetime(2019, 5, 7, 21, 25, 2),
)
self.assertEqual(
f("1970.01.01"),
f("1970-01-01"),
dt.EPOCH,
)
self.assertEqual(
f("1970.01.01"),
dt.NONE,
)
for value in ((), [], {}, None, 1, 2.3):
self.assertEqual(f(value), dt.EPOCH)
self.assertEqual(f(value), dt.NONE)
def test_parse_compat(self, f=dt.parse_compat):
self.assertEqual(
@@ -153,6 +157,11 @@ class TestDatetime(unittest.TestCase):
datetime.datetime(2019, 5, 7, 12, 25, 2),
)
def test_none(self):
self.assertFalse(dt.NONE)
self.assertIsInstance(dt.NONE, dt.datetime)
self.assertEqual(str(dt.NONE), "0101-01-01 00:00:00")
if __name__ == "__main__":
unittest.main()