Oops, I over-complicated that. Try this:

struct {
u8 code[5];
u8 unused[11];
} pttid[15];

This I will definitely do. I've seen it before but I guess until now I didn't realize what it was doing or why. Now I do. Thanks.

Now instead of calling pttid.code0, call pttid[0].code. Or:

for pttid in self._memobj.pttid:
_code = pttid.code
... # create setting, etc