We should check of the 3 mentioned projects (mod_wsgi, 
kdevelop-python, unbound) use the removed functions to suggest a similar replacement. I understood that there is no drop-in replacement.

unbound does not use to get the parsed Python code as CST, but uses PyParser_SimpleParseFile() just to display an error message to stderr. I understand that PyParser_ASTFromFileObject() + PyErr_Print() could be used.

But PyParser_ASTFromFileObject() is low-level, it requires to pass an arena object. Maybe the *intent* here is to call compile() and display the error message? Pseudo-code:

---
fp = fopen(filename, "r");
bytes = readall(fp);
PyObject *builtins = PyEval_GetBuiltins();
obj = PyObject_CallMethod(builtins, "compile", "O", bytes);
Py_DECREF(bytes);
if (!obj) {
    PyErr_Print();
}
else {
    Py_DECREF(obj);
}
fclose(fp);
---

This code is non-trivial :-( Should we provide a *new* C function doing that?

  Input: filename
  Output: code object

Or maybe I just missed an existing function :-)