On Tue, Jul 5, 2016 at 3:27 PM, eryk sun <eryk...@gmail.com> wrote:
> ChainMap implements the MutableMapping abstract base class. But
> CPython needs globals to be a dict. In the current implementation,
> LOAD_GLOBAL calls _PyDict_LoadGlobal, and STORE_GLOBAL calls
> PyDict_SetItem. They don't fall back on the abstract object APIs.
Sorry, I was replying from memory, but partly mixed up 2.x and 3.x. In
CPython 3.6, LOAD_GLOBAL does fall back on PyObject_GetItem, but
STORE_GLOBAL still does not. The latter is short enough to quote:
TARGET(STORE_GLOBAL) {
PyObject *name = GETITEM(names, oparg);
PyObject *v = POP();
int err;
err = PyDict_SetItem(f->f_globals, name, v);
Py_DECREF(v);
if (err != 0)
goto error;
DISPATCH();
}
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