gh-94808: cover PyFunction_GetDefaults and PyFunction_SetDefaults

[sobolevn]

• Issue: Metabug: Improving C-level coverage #94808

[sobolevn]

There's a difference with func_get_defaults:

static PyObject *
func_get_defaults(PyFunctionObject *op, void *Py_UNUSED(ignored))
{
    if (PySys_Audit("object.__getattr__", "Os", op, "__defaults__") < 0) {
        return NULL;
    }
    if (op->func_defaults == NULL) {
        Py_RETURN_NONE;
    }
    Py_INCREF(op->func_defaults);
    return op->func_defaults;
}

[JelleZijlstra]

This is correct because PyFunction_GetDefaults returns a borrowed ref.

[miss-islington]

Thanks @sobolevn for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.10.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

[miss-islington]

Thanks @sobolevn for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖

[miss-islington]

Sorry, @sobolevn and @JelleZijlstra, I could not cleanly backport this to 3.10 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker 7b24333fff51f9ca36ef19748016cc2b39ab6301 3.10

[miss-islington]

Sorry @sobolevn and @JelleZijlstra, I had trouble checking out the 3.11 backport branch.
Please retry by removing and re-adding the "needs backport to 3.11" label.
Alternatively, you can backport using cherry_picker on the command line.
cherry_picker 7b24333fff51f9ca36ef19748016cc2b39ab6301 3.11

[miss-islington]

Thanks @sobolevn for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.11.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

[miss-islington]

Sorry, @sobolevn and @JelleZijlstra, I could not cleanly backport this to 3.11 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker 7b24333fff51f9ca36ef19748016cc2b39ab6301 3.11

[JelleZijlstra]

@sobolevn (and maybe @mdboom) do you think it's worth manually backporting this, or are we only aiming for full coverage on main?