gh-93741: Add private C API _PyImport_GetModuleAttrString() (GH-93742)

It combines PyImport_ImportModule() and PyObject_GetAttrString()
and saves 4-6 lines of code on every use.

Add also _PyImport_GetModuleAttr() which takes Python strings as arguments.

1 files changed, 1 insertions, 8 deletions

diff --git a/Objects/abstract.c b/Objects/abstract.c
index 93987c2..5d50491 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -526,18 +526,12 @@ _Py_add_one_to_index_C(int nd, Py_ssize_t *index, const Py_ssize_t *shape)
 Py_ssize_t
 PyBuffer_SizeFromFormat(const char *format)
 {
-    PyObject *structmodule = NULL;
     PyObject *calcsize = NULL;
     PyObject *res = NULL;
     PyObject *fmt = NULL;
     Py_ssize_t itemsize = -1;
 
-    structmodule = PyImport_ImportModule("struct");
-    if (structmodule == NULL) {
-        return itemsize;
-    }
-
-    calcsize = PyObject_GetAttrString(structmodule, "calcsize");
+    calcsize = _PyImport_GetModuleAttrString("struct", "calcsize");
     if (calcsize == NULL) {
         goto done;
     }
@@ -558,7 +552,6 @@ PyBuffer_SizeFromFormat(const char *format)
     }
 
 done:
-    Py_DECREF(structmodule);
     Py_XDECREF(calcsize);
     Py_XDECREF(fmt);
     Py_XDECREF(res);