bpo-41025: Fix subclassing for zoneinfo.ZoneInfo (pythonGH-20965)

Prior to this change, attempting to subclass the C implementation of zoneinfo.ZoneInfo gave the following error: TypeError: unbound method ZoneInfo.__init_subclass__() needs an argument https://bugs.python.org/issue41025
threeifbyair · Aug 14, 2020 · 87d8287 · 87d8287
1 parent e55de68
commit 87d8287
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Showing 3 changed files with 5 additions and 3 deletions.
diff --git a/Lib/test/test_zoneinfo/test_zoneinfo.py b/Lib/test/test_zoneinfo/test_zoneinfo.py
@@ -463,7 +463,7 @@ class CZoneInfoDatetimeSubclassTest(DatetimeSubclassMixin, CZoneInfoTest):
     pass
 
 
-class ZoneInfoTestSubclass(ZoneInfoTest):
+class ZoneInfoSubclassTest(ZoneInfoTest):
     @classmethod
     def setUpClass(cls):
         super().setUpClass()
@@ -484,7 +484,7 @@ def test_subclass_own_cache(self):
         self.assertIsInstance(sub_obj, self.klass)
 
 
-class CZoneInfoTestSubclass(ZoneInfoTest):
+class CZoneInfoSubclassTest(ZoneInfoSubclassTest):
     module = c_zoneinfo
 
 

diff --git a/Misc/NEWS.d/next/Library/2020-06-18-10-34-59.bpo-41025.elf_nz.rst b/Misc/NEWS.d/next/Library/2020-06-18-10-34-59.bpo-41025.elf_nz.rst
@@ -0,0 +1,2 @@
+Fixed an issue preventing the C implementation of :class:`zoneinfo.ZoneInfo`
+from being subclassed.
diff --git a/Modules/_zoneinfo.c b/Modules/_zoneinfo.c
@@ -2557,7 +2557,7 @@ static PyMethodDef zoneinfo_methods[] = {
     {"_unpickle", (PyCFunction)zoneinfo__unpickle, METH_VARARGS | METH_CLASS,
      PyDoc_STR("Private method used in unpickling.")},
     {"__init_subclass__", (PyCFunction)(void (*)(void))zoneinfo_init_subclass,
-     METH_VARARGS | METH_KEYWORDS,
+     METH_VARARGS | METH_KEYWORDS | METH_CLASS,
      PyDoc_STR("Function to initialize subclasses.")},
     {NULL} /* Sentinel */
 };
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Fixed an issue preventing the C implementation of :class:`zoneinfo.ZoneInfo`
		from being subclassed.