commit 87d8287865e5c9f137f6b5cf8c34c2c509eb5e9d
author Paul Ganssle <paul@ganssle.io> Thu Aug 13 22:38:30 2020 -0400
committer GitHub <noreply@github.com> Thu Aug 13 22:38:30 2020 -0400
tree a7608fbc662266616e4955df41f75857c43edfca
parent e55de68be3e5b977a17d3c0ac9805b0feff8fedc

bpo-41025: Fix subclassing for zoneinfo.ZoneInfo (GH-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

Modules/_zoneinfo.c

diff --git a/Modules/_zoneinfo.c b/Modules/_zoneinfo.c
index bee84cb..12b3969 100644
--- a/Modules/_zoneinfo.c
+++ b/Modules/_zoneinfo.c
@@ -2557,7 +2557,7 @@
     {"_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 */
 };