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/complex.rst b/Doc/c-api/complex.rst
index 06dbb25..e2ea766 100644
--- a/Doc/c-api/complex.rst
+++ b/Doc/c-api/complex.rst
@@ -94,13 +94,13 @@
.. c:function:: int PyComplex_Check(PyObject *p)
Return true if its argument is a :c:type:`PyComplexObject` or a subtype of
- :c:type:`PyComplexObject`.
+ :c:type:`PyComplexObject`. This function always succeeds.
.. c:function:: int PyComplex_CheckExact(PyObject *p)
Return true if its argument is a :c:type:`PyComplexObject`, but not a subtype of
- :c:type:`PyComplexObject`.
+ :c:type:`PyComplexObject`. This function always succeeds.
.. c:function:: PyObject* PyComplex_FromCComplex(Py_complex v)