commit 28c91631c24e53713ad0e8a2bbae716373f5e53d
author AMIR <31338382+amiremohamadi@users.noreply.github.com> Sun Dec 08 15:05:59 2019 +0330
committer Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Sun Dec 08 03:35:59 2019 -0800
tree a870b24a5128a4424e85cd2e4ad6693417e1c0c4
parent 00ada2c1d57c5b8b468bad32ff24fa14113ae5c7

bpo-38979: fix ContextVar "__class_getitem__" method (GH-17497)



now contextvars.ContextVar "__class_getitem__" method returns ContextVar class, not None. 


https://bugs.python.org/issue38979



Automerge-Triggered-By: @asvetlov

Python/context.c

diff --git a/Python/context.c b/Python/context.c
index 26f2299..e0338c9 100644
--- a/Python/context.c
+++ b/Python/context.c
@@ -1024,9 +1024,10 @@
 
 
 static PyObject *
-contextvar_cls_getitem(PyObject *self, PyObject *args)
+contextvar_cls_getitem(PyObject *self, PyObject *arg)
 {
-    Py_RETURN_NONE;
+    Py_INCREF(self);
+    return self;
 }
 
 static PyMemberDef PyContextVar_members[] = {
@@ -1039,7 +1040,7 @@
     _CONTEXTVARS_CONTEXTVAR_SET_METHODDEF
     _CONTEXTVARS_CONTEXTVAR_RESET_METHODDEF
     {"__class_getitem__", contextvar_cls_getitem,
-        METH_VARARGS | METH_STATIC, NULL},
+        METH_O | METH_CLASS, NULL},
     {NULL, NULL}
 };