bpo-42528: Improve the docs of most Py*_Check{,Exact} API calls (GH-23602)
I think that none of these API calls can fail, but only few of them are
documented as such. Add the sentence "This function always succeeds" (which is
the same already used e.g. by PyNumber_Check) to all of them.diff --git a/Doc/c-api/method.rst b/Doc/c-api/method.rst
index 0a5341c..2385225 100644
--- a/Doc/c-api/method.rst
+++ b/Doc/c-api/method.rst
@@ -22,6 +22,7 @@
Return true if *o* is an instance method object (has type
:c:data:`PyInstanceMethod_Type`). The parameter must not be ``NULL``.
+ This function always succeeds.
.. c:function:: PyObject* PyInstanceMethod_New(PyObject *func)
@@ -64,7 +65,7 @@
.. c:function:: int PyMethod_Check(PyObject *o)
Return true if *o* is a method object (has type :c:data:`PyMethod_Type`). The
- parameter must not be ``NULL``.
+ parameter must not be ``NULL``. This function always succeeds.
.. c:function:: PyObject* PyMethod_New(PyObject *func, PyObject *self)