10000 gh-120782: Update internal type cache when reloading datetime by neonene · Pull Request #120829 · python/cpython · GitHub
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gh-120782: Update internal type cache when reloading datetime #120829

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Merged
merged 3 commits into from
Jun 21, 2024
Merged

gh-120782: Update internal type cache when reloading datetime #120829

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d9bdc48
add a test
neonene Jun 21, 2024
7c10284
invalidate type caches on reload
neonene Jun 21, 2024
285c3b6
📜🤖 Added by blurb_it.
blurb-it[bot] Jun 21, 2024
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17 changes: 17 additions & 0 deletions Lib/test/datetimetester.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6870,6 +6870,23 @@ def pickle_fake_date(datetime_) -> Type[FakeDate]:
""")
script_helper.assert_python_ok('-c', script)

def test_update_type_cache(self):
# gh-120782
script = textwrap.dedent("""
import sys
for i in range(5):
import _datetime
_datetime.date.max > _datetime.date.min
_datetime.time.max > _datetime.time.min
_datetime.datetime.max > _datetime.datetime.min
_datetime.timedelta.max > _datetime.timedelta.min
isinstance(_datetime.timezone.min, _datetime.tzinfo)
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Should this have assert?

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    assert isinstance(_datetime.timezone.min, _datetime.tzinfo)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError

    assert not isinstance(_datetime.timezone.min, _datetime.tzinfo)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError

Both fail, so this checks if it crashes or not. I agree this is not a good example.

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Given that the code looks a bit unusual, it would be worth adding a brief comment explaining that.

(Sorry I didn't notice this during my earlier review. Good catch, @JelleZijlstra.)

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Wouldn't it make sense to have these asserts actually check that the values are of the type they should be? The bug manifested itself as these values appearing to be objects of various random types.

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You could also assert that timezone.__dict__["min"] is timezone.min.

isinstance(_datetime.timezone.utc, _datetime.tzinfo)
isinstance(_datetime.timezone.max, _datetime.tzinfo)
del sys.modules['_datetime']
""")
script_helper.assert_python_ok('-c', script)


def load_tests(loader, standard_tests, pattern):
standard_tests.addTest(ZoneInfoCompleteTest())
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2024-06-21-12-00-16.gh-issue-120782.LOE8tj.rst
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@@ -0,0 +1 @@
Fix wrong references of the :mod:`datetime` types after reloading the module.
6 changes: 6 additions & 0 deletions Modules/_datetimemodule.c
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Expand Up @@ -7296,6 +7296,12 @@ _datetime_exec(PyObject *module)
static_assert(DI100Y == 25 * DI4Y - 1, "DI100Y");
assert(DI100Y == days_before_year(100+1));

if (reloading) {
for (size_t i = 0; i < Py_ARRAY_LENGTH(capi_types); i++) {
PyType_Modified(capi_types[i]);
}
}

if (set_current_module(interp, module) < 0) {
goto error;
}
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