It is common (more than 30 cases) in the C code to access a function or a variable from other module. For example:

 functools = PyImport_ImportModule("functools"); if (!functools) goto error; st->partial = PyObject_GetAttrString(functools, "partial"); Py_CLEAR(functools);

I propose to add a private helper function which combines PyImport_ImportModule() and PyObject_GetAttrString().

 st->partial = _PyImport_GetModuleAttrString("functools", "partial");

It will save 4-6 lines of code and a variable on every use.